A newly installed bridge touted as a feat of engineering collapsed on Florida International University's campus Thursday, killing at least four people. 
 
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 Aerial footage showed first responders tending to victims at the scene, searching for people in the rubble and loading others on stretchers into ambulances. 
 
 Firefighters pulled out at least four deceased people from the rubble, Miami-Dade Fire Chief Dave Downey said at an evening press conference. Recovery efforts were underway as of late Thursday, according to Miami-Dade County police. 
 
 Thank you first responders who assisted in the rescue efforts at the collapsed crossing bridge. Your efforts were valiant despite the final outcome. @MiamiDadePD will now begin the recovery of victims and investigation. We will get to the truth for the sake of the family. — Juan Perez (@JPerezMDPD) March 16, 2018 
 
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 The collapse occurred at about 1:30 p.m., Miami-Dade Fire Rescue Division Chief Paul Estopinan said in a press conference Thursday afternoon. 
 
 As of 5 p.m., a minimum of eight vehicles were trapped under the rubble, Estopinan said. Some workers were on the bridge when it collapsed, but officials did not detail whether any of them were among the dead. 
 
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 Ten injured victims, labeled as level-one trauma patients, were transported to nearby Kendall Regional Medical Center, program director Dr. Mark McKenney said in a press conference. 
 
 One of the patients was in cardiac arrest and another was in a coma with "severe extremity injuries" when they arrived, McKenney said. Those patients were in critical condition. 
 
 Eight other patients admitted to the hospital suffered from traumatic injuries such as bruises, abrasions and broken bones but were in stable condition, McKenney said. 
 
 The victims' ages ranged from 20 to 50 years old, McKenney said. Additional patients are believed to have been admitted to other area hospitals as well. 
 
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 More than 100 firefighters were on the scene working to find victims with the help of cranes and search dogs, and officials were working to stabilize the bridge. Their efforts are expected to be "long and arduous last well into the night, officials said. 
 
 One first responder, who owns a business across the street from the scene, worked on a victim for 15 minutes to keep him or her alive, said Orlando Lopez, mayor of the city of Sweetwater. 
 
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 Witness Suzy Bermudez told ABC News that she was sitting in traffic when she saw the bridge collapse from the left and then toward the middle. 
 
 Bermudez then jumped out of her car to run and help before she saw car lights that were smashed so badly there were almost hitting the ground. 
 
 One woman survived because her car was smashed on the rear, so Bermudez and others were able to pull her out, she said. 
 
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 FIU student Aleia Stillwell told ABC News that she was in her car when the structure fell in front of her. 
 
 The collapse sounded like thunder as the pieces of the bridge fell, she said. 
 
 Stillwell thanked God that she was driving slower than usual, adding that it could have been her under that bridge. 
 
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 Another driver, Jonathan Munoz-Conway, described the scene to ABC News as surreal and terrifying, adding that he had just driven under the bridge about 30 seconds before it collapsed. 
 
 Munoz-Conway said that after he drove past, he turned right into a parking garage next to the bridge. He then heard a loud bang and assumed he had hit something with his car before he heard a girl scream and saw police officers rushing to the scene. 
 
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 Witness Tiona Page told ABC News that the screams coming from the cars were "terrifying." 
 
 "As soon as I looked outside, I saw dust flying everywhere," she said. "I knew the bridge had collapsed." Bystanders rushed in to help those trapped, but struggled to dig through the rubble. 
 
 It was not immediately clear what led to the collapse. 
 
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 The street that the bridge stretches over, Southwest Eighth Street, is a busy seven-lane road that runs from downtown Miami all the way to the Everglades. Students and faculty had been calling for a bridge at the crossing of 8th Street and 109th Street, where pedestrians were required to cross through heavy traffic, The Miami Herald reported. 
 
 The bridge was supposed to be iconic for the city, Lopez said. 
 
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 A section of 8th Street was closed over the weekend to allow workers to position the 174-foot bridge, according to PantherNOW, a university newspaper. 
 
 First-of-its-kind pedestrian bridge “swings” into place. “FIU is about building bridges and student safety. This project accomplishes our mission beautifully,” -President Mark B. Rosenberg. https://t.co/x8gPM9A4DG #worldsahead pic.twitter.com/mPEMeh2zmw — FIU (@FIU) March 10, 2018 
 
 FIU touted the bridge to be one of the first of its kind, tweeting that it was swung into place on Saturday. 
 
 The company that moved the bridge into place, Barnhart Crane & Rigging, said in a statement that it was only contracted to move the bridge and was not involved with the design or construction of the bridge. 
 
 "Our scope of work was completed without incident and according to all technical requirements," the company said, adding that it would cooperate with investigators and offering condolences to the victims. 
 
 In a statement, the university said it was "shocked and saddened about the tragic events unfolding on campus." 
 
 FIU President Mark Rosenberg expressed his "immense sadness" toward the victims and their families and lamented over the failed project in a press conference Thursday evening. 
 
 "Five days ago we were celebrating that it was in the process of being erected," Rosenberg said of the bridge. "This bridge was about collaboration. It was about hope. It was about opportunity. It was about determination. The bridge was about strength and unity." 
 
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 According to an FIU press release, the 174-foot, 950-ton bridge was just installed "in a few hours" using "accelerated bridge construction" methods, which the university said "reduces potential risks to workers, commuters, and pedestrians and minimizes traffic interruptions." 
 
 An engineering company performed a stress test on the bridge Thursday morning, Ralph Ventura, deputy city manager and chief of staff of Sweetwater, told ABC News. It is unclear whether the test was ongoing or had been completed before the collapse. 
 
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 While there are "a number of reasons why a bridge might fail," that hazard is increased for any new engineering structure, Hiba Baroud, an assistant professor of civil and environmental engineering at Vanderbilt University, told ABC News. 
 
 "Any problem related to the beginning life of a structure is related to its quality, whereas the reliability of a structure is maintaining that quality over time," she said. 
 
 The NTSB is launching an investigation into the collapse. A team of 15 specialists -- including civil engineering, material science and survival factor experts -- is expected to arrive in Miami tonight and will begin their investigation in the morning, NTSB Chairman Robert Sumwalt said in a press conference. 
 
 When asked by a reporter whether he was aware of any issues with this type of bridge in the past, Sumwalt replied, "To my knowledge, no." 
 
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 The bridge was not a Florida Department of Transportation project, and the designer, contractor and the construction engineering and inspection are all under contract with the university, the Florida DOT said. 
 
 Figg Engineering designed the project, and the Munilla Construction Management both built and installed the structure, according to the Florida DOT. Bolton Perez and Associates handled the construction engineering and inspection, the agency added. 
 
 An independent, secondary design check was required due to the unique characteristics of the design of the bridge, according to the Florida DOT. FIU was responsible for selecting the firm used to conduct the review, but the firm they chose, Louis Berger, was not pre-qualified by the Florida DOT for the service, "which is required under FIU's agreement with the state," the agency said. 
 
 ABC News has reached out to Louis Berger for comment. 
 
 Rosenberg told reporters that all of the contractors were vetted, especially since federal funds were used in the project. He added that he found the testing that was being done to be satisfactory. 
 
 Munilla Construction Management said in a statement that it will conduct a "full investigation to determine exactly what went wrong" and that it will cooperate with investigators on the scene "in every way." 
 
 "The new UniversityCity Bridge, which was under construction, experienced a catastrophic collapse causing injuries and loss of life," the company said. "MCM is a family business and we are all devastated and doing everything we can to assist." 
 
 Another company that took part in the bridge's construction, FIGG Engineering, said in a statement that it was "stunned" and that "nothing like this has ever happened before" in its 40-year history. 
 
 "Our deepest sympathies are with all those affected by this accident," the company said. "We will fully cooperate with every appropriate authority in reviewing what happened and why." 
 
 The bridge was scheduled to be fully completed in January 2019, PantherNOW reported. It cost a total of $14.2 million, largely funded by an $11.4 million grant from the U.S. Department of Transportation, a DOT spokesperson told ABC News. 
 
 Florida Senator Marco Rubio described the incident as "troubling and tragic," adding that it affects him personally because he has been an adjunct professor for the university for 10 years. 
 
 "Ironically, it's a project for safety" that was constructed after a student died last year crossing that intersection, Rubio said during an evening press conference. 
 
 Terrible news coming from Miami as a pedestrian bridge has collapsed at @FIU and multiple deaths are reported. We will pray for the victims and the entire Panther community. — Marco Rubio (@marcorubio) March 15, 2018 
 
 Florida Gov. Rick Scott said in a press conference Thursday that he would "hold anybody accountable" culpable of wrongdoing during the conception and construction of the bridge. 
 
 I have directed the Florida Highway Patrol to offer resources to aid local law enforcement’s response in Miami. They will be offering additional troopers to aid in search and rescue as well as traffic control. @FLHSMV — Rick Scott (@FLGovScott) March 16, 2018 
 
 Miami Mayor Carlos Gimenez released a statement saying he is "actively monitoring" the "tragic situation" from abroad. He has dispatched Deputy Mayor Maurice Kemp to the scene, he said. 
 
 "Our thoughts and prayers are with the people affected by this tragedy and with the first responders who are on the scene," Gimenez said. 
 
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 FIU is one of the 10 largest universities in the country, with nearly 54,000 students enrolled, according to its website. 
 
 ABC News' Jeff Cook, Erin Dooley, Rachel Katz, Meghan Keneally, Dominick Proto, Darren Reynolds, Emily Shapiro, Ben Stein and Daniel Steinberger contributed to this report. ||||| UPDATE: As of Friday morning, six people are confirmed dead. 
 
 A pedestrian bridge under construction collapsed Thursday, just days after crews had dropped an elevated 950-ton span in place on a signature project that was intended to give Florida International University students a safe route across the busy roadway. 
 
 The massive span — in a sudden, catastrophic failure — crashed down across eight lanes of heavily traveled Tamiami Trail, flattening eight cars. The death toll remained uncertain as rescue crews continued to work into the night to reach vehicles but late Thursday Miami-Dade fire chief Dave Downey confirmed at least four people had been killed, including a student from FIU, police sources said. 
 
 Nine people had been pulled from the rubble by evening and rushed to Kendall Regional Medical Center’s trauma unit, including two who required immediate surgery. The others sustained injuries ranging from scrapes and bruises to broken bones, which were not considered life threatening. On campus, some families waited for word on missing loved ones. 
 
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 Even before the dust from the disaster settled, motorists scrambled from their cars to help. At least one woman, Katrina Collazo, was pulled from her half-crushed car, miraculously unscathed. 
 
 “Thank God ... my daughter is alive,” said her mother, Ada Collazo, in Spanish, after rushing to the scene, fearful that another family member also might have been riding in the back. “I thought my granddaughter was in the car, but she wasn’t. She’s in school.” 
 
 Collazo said her daughter, who had been on campus for a nursing meeting, stopped at a red light when she said she heard what sounded like small rocks falling on her car. As she turned around, the span mashed everything behind the driver seat. The car next to her was not as lucky. That vehicle was flattened like an aluminum can. 
 
 The FIU bridge collapsing... I’m still in shock pic.twitter.com/ZNqO2z5ch6 — Megan (@meganmfernandez) March 15, 2018 
 
 It was not immediately clear what caused the collapse of a $14.2 million structure FIU had touted as an innovative “instant” bridge because of construction techniques intended to speed up the work and minimize disruption to commuter traffic. The bridge’s main 175-foot span, assembled on the side of the road, was raised into place across Tamiami Trail on Saturday in less than six hours. But the project was far from complete and not expected to open to student foot traffic until 2019. 
 
 Several witnesses reported that two workers were on the bridge when it collapsed shortly before 2 p.m. Early in the day, Miami-Dade Mayor Carlos Gimenez said the bridge had undergone a “stress test” but it was unclear what, if any, role that might have played in the failure. FIU President Mark Rosenberg confirmed there was testing on the bridge sometime before the collapse, but said the testing was proper. 
 
 “I have not spoken directly to Munilla Construction, but I am satisfied that the testing that was occurring was consistent with best practices," Rosenberg said shortly after 8 p.m. “I’m not an engineer, so I'm not privy to those details. I know that tests occurred today. And I know, I believe, that they did not prove to lead anyone to the conclusion that we would have this kind of a result. But I do not know that as a fact.” 
 
 Late Thursday, came the first definitive word from a government official about what was being done on the bridge when it fell. U.S. Sen. Marco Rubio, R-FL, said in a Twitter post that: “The cables that suspend the #Miami bridge had loosened & the engineering firm ordered that they be tightened. They were being tightened when it collapsed today.” 
 
 Rubio, a Miami Republican, did not elaborate on the information. But he was in a position to know inside details about the catastrophe. 
 
 He traveled to the FIU campus Thursday on same plane with Rosenberg. He said he spoke to MCM partner Pedro Munilla amid the rubble and he attended private briefings at FIU. 
 
 The late post came soon after Gov. Rick Scott and Rubio both promised swift investigations. 
 
 “We will hold anybody accountable if anybody has done anything wrong,” Scott said. 
 
 Rubio also vowed an “exhaustive” review with scrutiny of “science and engineering” that went into the project. “The families and the survivors deserve to know what went wrong,” he said. 
 
 The National Transportation Safety Board announced that it was dispatching a team of 15 to examine the collapse and investigators expected to be on site by late Thursday. 
 
 Authorities stressed that it could take days or more to determine what went wrong. But one agency, the Florida Department of Transportation, quickly distanced itself, issuing a fact sheet saying it had a limited role in the project and emphasizing FIU’s responsibility for testing and safely completing the bridge. 
 
 Designed as a cable-supported bridge, the project was a collaboration between MCM Construction, a prominent Miami-based contractor, and FIGG Bridge Design, based in Tallahassee. FIGG is responsible for the iconic Sunshine Skyway Bridge across Tampa Bay. 
 
 FIGG issued a statement Thursday saying the company was “stunned” by the collapse and promising to cooperate with every authority investigating the collapse. 
 
 “In our 40-year history, nothing like this has ever happened before,” the company’s statement said. “Our entire team mourns the loss of life and injuries associated with this devastating tragedy, and our prayers go out to all involved.” MCM Construction Management, which is building the bridge, posted a message to the company’s Facebook page promising “a full investigation to determine exactly what went wrong.” 
 
 Mayor Gimenez, in Hong Kong on a trade mission, said in a telephone interview that he instructed county rescue workers to identify license plates from the trapped cars as quickly as possible so that families could be notified. 
 
 Rescue crews with specially trained dogs and listening devices were poring over the wreckage, hoping to find survivors. About two hours after the collapse, crews also brought in heavy equipment to probe under sections of the shattered span. 
 
 “I don’t know what’s under the bridge, under the rubble,” said Lt. Alex Camacho of the Florida Highway Patrol. “It’s impossible to see.” 
 
 The injured were transported to the trauma center at Kendall Regional. Mark McKenney, chief of the trauma department, said the 10 injured patients ranged in age from 20 to 50 years old, including one man whose heart had stopped beating when he arrived. 
 
 Doctors revived the man, who was not identified, and wheeled him into the operating room. He is listed in critical condition with head and chest injuries. 
 
 A second patient arrived comatose with severe injuries that required orthopedic and neurosurgery, the hospital spokesperson said. The remaining eight patients are in stable condition with injuries ranging from scrapes and bruises to broken bones. 
 
 FIU spokesperson Maydel Santana-Bravo issued a statement, even as rescue crews were still working the scene. 
 
 “We are shocked and saddened about the tragic events unfolding at the FIU-Sweetwater Bridge,” she said. “At this time, we are still involved in rescue efforts and gathering information. We are working closely with authorities and first responders on the scene. We will share updates as we have them.” 
 
 FIU students are on spring break this week, but traffic was expected to be heavy with the Miami-Dade County Youth Fair opening nearby on Thursday. 
 
 President Donald Trump also posted a tweet, “Continuing to monitor the heartbreaking bridge collapse at FIU — so tragic.” 
 
 Students and faculty have long clamored for a bridge at the 109th Avenue crossing, where students on foot have to scurry across heavily traveled Tamiami Trail, which divides the campus from Sweetwater. Though FIU provides shuttles, many students prefer to walk. In August, FIU undergraduate Alexis Dale was hit and killed by a motorist while crossing the intersection. 
 
 The pedestrian walkway was installed in a single morning at Southwest 109th Avenue on Saturday, intended eventually to link FIU’s Modesto A. Maidique Campus to the small suburban city of Sweetwater, where the university estimates 4,000 of its students live. 
 
 FIU, which has an “accelerated bridge construction” program in its engineering school, promoted the project’s innovative approach. A 175-foot section of the overall 320-foot long bridge was fabricated by the side of the Trail while support columns were erected in place. The 950-ton span was lifted off the ground by a mechanical transporter, swung into position across the Trail, then lowered into place over the support columns. That reduced to a minimum the time the trail had to be closed to traffic, and minimized risks to workers and people in the vicinity, FIU said. 
 
 This is a breaking news story and will be updated as more is learned. 
 
 Miami Herald Staff Writers Howard Cohen, Alex Harris, David J. Neal, Charles Rabin, David Smiley, Jennifer Staletovich, Carli Teproff and Martin Vassolo contributed to this report. ||||| CBSMIAMI.COM: Facebook | Twitter 
 
 MIAMI (CBSMiami) — Florida International University’s (FIU) massive new pedestrian bridge collapsed, killing at least four people and crushing several vehicles under it. 
 
 “We have located four deceased,” confirmed Miami-Dade Fire Rescue Chief Dave Downey at a Thursday night news conference. 
 
 Read: National Transportation Safety Board Investigating Bridge Collapse At Florida International University 
 
 The 950-ton bridge, located at 109th Ave and 8th Street, came crumbling down onto a number of cars. 
 
 “I was looking at the bridge. It was fine and all of a sudden, I saw it collapse from the left towards the middle,” said the witness to CBS4’s Ted Scouten. “I jumped out of my car and I ran towards the victim to see if we could help anybody but when I saw, the only thing you could see were the car lights in the front. It was totally smashed, almost to the ground. So, there was only one girl who survived. It smashed the back-end of her car…they were able to pull her out….They couldn’t get anyone out of their cars. They’re smashed.” 
 
 Miami-Dade Police Chief Juan Perez said 8 people have been taken to the hospital and eight vehicles are stuck under the bridge and the number of dead is undetermined. At least one person has reportedly died. 
 
 “We do know that there are 8 vehicles that they can see that are under there,” said Miami-Dade County Commissioner Joe Martinez. “In reality, nobody can tell you if it was a vehicle that only had a driver or had a driver and 4 passengers. So, when you’re asking about numbers, we really don’t know.” 
 
 Dr. Mark McKenny at Kendall Regional Medical Center said they have two patients in critical condition and 8 others in stable condition. He said there were other patients taken to other hospitals. 
 
 Miami-Dade Fire Rescue said they continue to search for “viable victims,” meaning they believe someone could be still alive under the rubble. Search and rescue crews are expected to work into the night. 
 
 Gallery: Scene of the FIU Bridge Collapse 
 
 The cars were reportedly stopped at a red light when the pedestrian bridge collapsed around 1:30 p.m. Thursday. 
 
 “I saw the bridge just collapse in front of me and it fell on the cars that were sitting, waiting there for the light to change,” the same witness told Scouten. 
 
 “I just heard a really loud crash…I ran to my balcony and then I saw that it was down,” said witness Chelsea Morsey who lives in a high-rise tower just feet away from the bridge. “It was complete chaos. There was everybody running around and I saw just a couple of cars like sticking out.” 
 
 “There were no warning signs. It looks like it just came down,” an official told CBS4’s Jim DeFede. 
 
 Senator Bill Nelson says the National Transportation Safety Board (NTSB) is “launching and leading an investigation into the bridge collapse.” 
 
 Witness Aura Martinez who spoke with CBS4 said, “It was such a scary feeling because I saw [the collapse] and I didn’t know what to do,” she told CBS4. “It just literally killed people and so we ran out there and tried to help people we saw. One girl, her car, it was literally a miracle of God because her car was just squished at the back. … It was very traumatizing.” 
 
 Martinez is a sophomore who was trying to find her friend who was one of the victims in the car when the bridge collapsed. 
 
 FIU issued a statement to about the deadly incident, saying, 
 
 “We are shocked and saddened about the tragic events unfolding at the FIU-Sweetwater pedestrian bridge. At this time we are still involved in the rescue efforts and gathering information. We are working closely with authorities and first responders on the scene. We will share updates as we have them.” 
 
 The president of FIU, Mark Rosenberg, issued a statement saying he was ‘heartbroken’ by the news, saying in part, “We send our deepest condolences to the victims and the families. We are working to appropriate agencies to assist in rescue efforts.” 
 
 Florida Governor Rick Scott will be at FIU this evening to get briefed by law enforcement and school officials. He says he’s spoken with Miami-Dade Police Chief Juan Perez and will stay in contact with law enforcement through the day. 
 
 A family reunification center has been set up at FIU’s campus in the Student Academic Success Center (SASC), Room 100. Families or friends worried that someone they know could have been a victim can call 305 348-3481. 
 
 As for traffic in the area, 8th Street is shutdown in both directions. Law enforcement is asking the public to avoid the area between SW 107th Ave to SW 117th Ave and 8th Street indefinitely. 
 
 “Please stay out of the area,” said Chief Perez. 
 
 The company that built the bridge, MCM, issued a statement saying: “Our family’s thoughts and prayers go out to everyone affected by this terrible tragedy. The new UniversityCity Bridge, which was under construction, experienced a catastrophic collapse causing injuries and loss of life. MCM is a family business and we are all devastated and doing everything we can to assist. We will conduct a full investigation to determine exactly what went wrong and will cooperate with investigators on scene in every way.” 
 
 FIGG Bridge Group also helped put together the bridge and issued a statement saying: “We are stunned by today’s tragic collapse of a pedestrian bridge that was under construction over Southwest Eighth Street in Miami. Our deepest sympathies are with all those affected by this accident. We will fully cooperate with every appropriate authority in reviewing what happened and why. In our 40-year history, nothing like this has ever happened before. Our entire team mourns the loss of life and injuries associated with this devastating tragedy, and our prayers go out to all involved.” 
 
 Barnhart Crane and Rigging moved the bridge into place on Saturday. They issued a statement saying in part: “Barnhart Crane and Rigging was saddened by the news of the tragedy that occurred in Miami with the collapse of the Florida International University pedestrian bridge. Barnhart was contracted to move the bridge into place and was not involved with the design or construction of the bridge. Our scope of work was completed without incident and according to all technical requirements.” 
 
 The bridge went up on Saturday . It was then lowered into its final position, just west of 109th Avenue that day. The main span was built next to Southwest 8th Street. 
 
 The bridge was meant to be part of a larger transportation initiative to create a safer path for students and local residents. It was constructed using an innovative approach to bridge construction – a technique meant to reduce potential risks to workers, commuters, and pedestrians and prevented traffic tie-ups in the area. 
 
 The positioning of the bridge Saturday was the largest pedestrian bridge move via Self-Propelled Modular Transportation, in U.S. history. 
 
 Funding for the $14.2 million bridge, connecting plazas and walkways is part of a $19.4 million Transportation Investment Generating Economic Recovery (TIGER) grant from the U.S. Department of Transportation. Other funding agencies include the Federal Highway Administration, Florida Department of Transportation Local Agency Program, FIU and the City of Sweetwater. 
 
 Construction for the bridge began in the spring of 2017 and was expected to be completed in early 2019. 
 
 (GALLERY: Pictures showing the scene of the bridge collapse)
– Officials say several people are dead after a new pedestrian bridge collapsed onto a road near the Florida International University campus Thursday in Miami, CBS Miami reports. According to the Miami Herald, the 950-ton bridge was installed Saturday to provide pedestrian access between FIU's main campus and an area where students live in off-campus housing and new dorms. The Florida Highway Patrol says five to six vehicles were crushed under the collapsed bridge, ABC News reports. The highway patrol says several people were killed, but an exact number of injuries and fatalities is unknown. It's also unknown why the pedestrian bridge collapsed. The bridge was built using a new method meant to reduce risks to workers and traffic impacts during construction.