Last Wednesday, students from Great Mills High School in Southern Maryland joined a nationwide “school walkout” to call for an end to gun violence and more school safety measures. 
 
 On Tuesday morning, those same students were evacuated from their own school after gunfire rang out. 
 
 The suspected gunman, 17-year-old student Austin Wyatt Rollins, was pronounced dead hours later at a local hospital. Two teenage students were being treated for their injuries — one, Jaelynn Willey, was in critical condition — and a school resource officer who fired at the gunman was unharmed. 
 
 “This is what we train for. This is what we prepare for and this is what we pray we never have to do,” said St. Mary’s County Sheriff Tim Cameron. “And on this day we realized our worst nightmare that our greatest asset — our children — were attacked in a bastion of safety and security, one of our schools.” 
 
 The entire incident played out in less than a minute at 7:55 a.m. in a hallway at Great Mills, a school 90 miles south of Baltimore that enrolls about 1,600 students. 
 
 Cameron said Rollins fired a Glock 9-millimeter gun at a 14-year-old boy and a 16-year-old girl, who was later identified as Willey. There’s “an indication that a prior relationship existed between the shooter and the female victim,” Cameron said, an angle that investigators were pursuing Tuesday. 
 
 The school’s resource officer, Deputy First Class Blaine Gaskill, responded quickly to the scene and “engaged” the shooter, Cameron said. As Gaskill fired at Rollins, Rollins “almost simultaneously” fired his gun, Cameron said. 
 
 Investigators are still trying to determine which bullets struck which individuals. 
 
 Willey suffered life-threatening injuries and was in critical condition at the University of Maryland Prince George’s Hospital Center, while the 14-year-old boy was in good condition at MedStar St. Mary’s Hospital. 
 
 Three people were injured in a shooting at Great Mills High School in Southern Maryland on Tuesday morning, according to a county spokesman. 
 
 Officers from multiple agencies are assisting with the investigation into the shooting, which included searching a car and a home, combing through social media accounts, interviewing witnesses, reviewing footage from surveillance cameras and tracing the ownership of the gun used by the student. Cameron said there were no immediately obvious warning signs on social media before the shooting, but said investigators still needed to take a deeper look. 
 
 The St. Mary’s County Sheriff’s Office urged anyone with information about the incident to contact the FBI. 
 
 Gaskill, the school resource officer, was in uniform at the time of the incident. He’s been with the sheriff’s office for nearly six years, after four years as a correctional officer. He’s been assigned to Great Mills as a school resource officer since the start of the school year. 
 
 Cameron praised Gaskill for responding quickly to the scene. He said all his deputies have been trained in how to respond to active-shooter situations as a single officer, instead of waiting to assemble a team. 
 
 “You go to the sound of gunfire,” he said. 
 
 Deputies, the school nursing staff and others provided first aid to the three teens who were shot, including applying a tourniquet and performing CPR, Cameron said. 
 
 Senior Terrence Rhames was standing with his friends outside their first-period class when he heard a shot. He knew instantly what the loud crack meant. 
 
 He started running, heading to a first-floor bathroom before thinking, “This is a dead end.” He turned instead to sprint toward the nearest exit. Out of the corner of his eye, Rhames said, he saw a girl fall. 
 
 “I just thank God I’m safe,” said Rhames, 18. “I just want to know who did it and who got injured.” 
 
 Parents were asked to meet their children at a reunification site on the Leonardtown High School campus, where counselors and other support staff were on hand. 
 
 Lexington Park resident Shonita Somerville said she had just dropped off her 11th-grade daughter when she got a call from her saying that there was a shooting in the school. 
 
 “She was walking in the hallway and said she heard a gunshot and kids running and crying and police running in with their guns,” Somerville said. 
 
 Somerville and her daughter were reunited two hours later. 
 
 “I never thought something like this would happen here. St. Mary’s is a small little place. Now, I can say: ‘You think it wouldn’t happen? It can happen to anybody,’ ” Somerville said. 
 
 No one answered the door Tuesday afternoon at Rollins' home in Lexington Park. 
 
 Toni Foreman, who lives across the street, said she was shocked to learn that Rollins might have been involved in the shooting. 
 
 He would often walk her son, 13-year-old Ivan Foreman, home after school, and just last week, the two boys played catch, she said. "I didn't know he had any guns," she said. "He was a very good kid." 
 
 She hesitated to say she regretted letting Rollins watch her son. "I don't know what the situation was," she said. "I wish he would have reached out for help." 
 
 "He just couldn't handle the situation," whatever it was that troubled him, Ivan chimed in. 
 
 Mostly, Foreman said she felt sorrow for Rollins' family and the two victims. "My heart goes out to all the families involved," she said. "They are all victims." 
 
 The Great Mills shooting comes just over a month after a deadly rampage in a Florida high school. Seventeen people died in the Marjory Stoneman Douglas High School shooting, catalyzing a national conversation about gun violence in schools. 
 
 Last Wednesday, Great Mills students participated in the “school walkout” on the one-month anniversary of the Parkland shooting. The students called for an end to gun violence and more school safety measures. 
 
 Mikki Braley, 14, was among more than 100 Great Mills students who walked out of class last week. Those same students were evacuated from class Tuesday. “I find it crazy,” she said. “Just a week ago we were protesting against this, and now we have a shooting in our school.” 
 
 One of the student activists from Marjory Stoneman Douglas tweeted her anger about the Great Mills incident. 
 
 “Less than a WEEK ago Great Mills High School students walked out with us to protest gun violence...now they’re experiencing it for themselves,” Jaclyn Corin wrote. “The state of our country is disgusting -- I’m so sorry, Great Mills.” 
 
 Great Mills High School will be closed Wednesday, and potentially through the end of the week, said St. Mary’s County Public Schools superintendent James Scott Smith. ||||| Deputies and federal agents converge on Great Mills High School, the scene of a shooting, Tuesday morning, March 20, 2018 in Great Mills, Md. The shooting left at least three people injured including... (Associated Press) 
 
 Deputies and federal agents converge on Great Mills High School, the scene of a shooting, Tuesday morning, March 20, 2018 in Great Mills, Md. The shooting left at least three people injured including the shooter. Authorities said the situation is "contained." (AP Photo/Alex Brandon ) (Associated Press) 
 
 GREAT MILLS, Md. (AP) — The Latest on the shooting at a Maryland high school (all times local): 
 
 11:30 a.m. 
 
 A sheriff says the shooter at a Maryland high school has died after a school resource officer fired at him. 
 
 St. Mary's County Tim Cameron told a news conference Tuesday morning that the shooter and the officer both fired a round and it wasn't known if the officer's bullet killed the suspect. 
 
 Cameron says a female student and a male student were also wounded in the shooting in a hallway at Great Mills High School in southern Maryland. 
 
 ___ 
 
 10:45 a.m. 
 
 The principal at the Maryland high school where there was a shooting Tuesday morning told parents last month that the school had investigated threats of a possible shooting and found they were "not substantiated." 
 
 Great Mills High School Principal Jake Heibel told parents that school officials interviewed two students in February who were overheard mentioning a school shooting and found that they posed no threat. His letter was posted on the local news site The Bay Net. 
 
 But Heibel said the school still increased its security after social media posts about a possible school shooting "circulated quite extensively." 
 
 St. Mary's County Sheriff's spokeswoman Cpl. Julie Yingling says three people, including the shooter, were injured in Tuesday's shooting. 
 
 ___ 
 
 10:15 a.m. 
 
 A sheriff's spokeswoman says three people have been injured in a shooting at a high school in southern Maryland, including the shooter. 
 
 St. Mary's County Sheriff's spokeswoman Cpl. Julie Yingling says there have been no fatalities in the Tuesday morning shooting at Great Mills High School. 
 
 Yingling says the two victims were shot, but she doesn't know how the shooter was injured. She also didn't have the identities of the any of the three injured. 
 
 She says all three had been transported to hospitals. 
 
 ___ 
 
 10 a.m. 
 
 FBI agents are on the scene of a shooting at a high school in southern Maryland. 
 
 FBI spokesman David Fitz says the agents are there to assist the local sheriff's office and he had no immediate information about injuries or fatalities at Great Mills High School. 
 
 Agents from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives have also been sent to the school. 
 
 The county sheriff said deputies are on the scene and that parents or guardians should stay away, going instead to Leonardtown High School to reunite with Great Mills students there. 
 
 ___ 
 
 9:30 a.m. 
 
 A sheriff's spokeswoman says injuries have been reported after a shooting at a high school in southern Maryland. 
 
 St. Mary's County sheriff's spokeswoman Cpl. Julie Yingling says there are injuries Tuesday at Great Mills High School but she didn't know how many or the severity of the injuries. She also said she had no information about fatalities. 
 
 Agents from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives were headed to the scene. 
 
 The county sheriff said deputies are on the scene and that parents or guardians should stay away, going instead to Leonardtown High School to reunite with Great Mills students there. 
 
 Maryland Gov. Larry Hogan and Rep. Steny Hoyer tweeted that they're monitoring reports and urged people to follow the instructions of local law enforcement at the scene. 
 
 ___ 
 
 9:10 a.m. 
 
 School officials report that there's been a shooting at a Maryland high school, that the 'event is contained' and the campus is on lockdown. 
 
 Federal agents from the bureau of Alcohol, Tobacco and Firearms are going to the scene, their agency tweeted. 
 
 The St. Mary's County Public Schools said on its website early Tuesday that there was a shooting at Great Mills High School, located in the southern end of the state. 
 
 The county sheriff said deputies are on the scene, and that parents or guardians should stay away, going instead to Leonardtown High School to reunite with Great Mills students there. 
 
 Maryland Gov. Larry Hogan and Rep. Steny Hoyer tweeted that they're monitoring reports and urged people to follow the instructions of local law enforcement at the scene. ||||| Authorities investigate a shooting at a Maryland high school that left a 16-year-old girl fighting for her life. Chris Gordon reports. (Published Tuesday, March 20, 2018) 
 
 A student pulled out a gun and shot two other students at a high school in southeast Maryland Tuesday morning before he was fatally wounded, authorities say. 
 
 
 
 Austin Wyatt Rollins, 17, entered Great Mills High School in Great Mills at the beginning of the school day and used a semi-automatic handgun to shoot 16-year-old Jaelynn Willey in a hallway, Sheriff Tim Cameron said. A male student also was shot in the leg. 
 
 There is an indication that a prior relationship existed between the shooter and the female victim, Cameron said. Details on a potential motive are not yet clear. 
 
 Willey was transferred to the ICU at UM Prince George's Hospital Center, where she has life-threatening injuries, Cameron said. 
 
 Jaelynn Willey 
 
 Photo credit: Family Photo 
 
 "This morning, our family was devastated to learn that our beautiful Jaelynn was one of the victims in a school shooting at her high school, Great Mills," read a family statement provided by Willey's uncle. 
 
 
 
 The 14-year-old male victim is in good condition, according to the MedStar St. Mary's Hospital. Rollins has died, Cameron said. 
 
 "On this day we realize our worst nightmare — that our greatest asset, our children, were attacked in a bastion of safety and security," Cameron said. 
 
 
 
 The student opened fire at 7:55 a.m., Cameron said. 
 
 High School Shooting Shocks Maryland Community 
 
 Students and parents say they are uneasy after a student shot two other students at Great Mills High School in Maryland. Darcy Spencer reports. (Published Tuesday, March 20, 2018) 
 
 Terrence Rhames, an 18-year-old student, told MSNBC that he and his friends were talking in the hallway when they heard a gunshot. 
 
 "We were just standing there talking and we heard like, a loud shot, like a few yards away from us," Rhames said. 
 
 Rhames said he and his friends started running to the main road outside and saw others "flooding out" the main entrance. Others hid in classrooms. 
 
 "If you don't think this can happen at your school, you are sadly mistaken. We are shaken but we are very strong at St. Mary’s," St. Mary’s County Public Schools Superintendent James Scott Smith said. 
 
 The shooter and a school resource officer each fired a round, but authorities don't know if the officer's bullet killed the suspect, Cameron said. The officer, whom Cameron identified as St. Mary's County Sheriff's Deputy Blaine Gaskill, was not hurt. 
 
 Shooter Dead, 2 Students Injured in Md. School Shooting 
 
 "When the shooting took place, our school resource officer, who was stationed inside the school, was alerted to the event and the shots being fired. He pursued the shooter and engaged the shooter, during which that engagement he fired a round at the shooter," Cameron said. 
 
 Cameron said the shooter fired a round simultaneously. Cameron said Rollins was armed with a Glock semi-automatic handgun. 
 
 "In the days to come, through a detailed investigation, we will be able to determine if our SRO's round struck the shooter," Cameron said. 
 
 Neighbors Describe Maryland School Shooter as Friendly 
 
 Neighbors of the gunman in the Great Mills High School shooting are surprised he could do that. Meagan Fitzgerald reports. (Published Tuesday, March 20, 2018) 
 
 The school was locked down and the incident was contained, according to the school's website. 
 
 Cameron told News4 that his department prepares for emergencies. But despite the fast response of the school resource officer, or SRO, two students were still shot. 
 
 "You train to respond to this and you hope that you never ever have to," he said. "This is the realization of your worst nightmare — that, in a school, that our children could be attacked. And so as quickly … as that SRO responded and engaged, there’s grievous injuries to two students." 
 
 He added, "Now begins the second phase of this operation, and that’s the background and the investigation and the attempt for the school to return to normal." 
 
 Photo credit: NBC 
 
 Willey's family said she is the second oldest of nine children and is a member of the school's swimming team. They asked to consider donating to her fundraiser here. 
 
 A Twitter post from the St. Mary's County Sheriff's Office asked parents not to report to the school. They were asked to go to nearby Leonardtown High School to reunite with their children. 
 
 Family members of the students parked along roads and in nearby shopping centers as they rushed to meet their kids. 
 
 One recent graduate hurried to pick up her sister, who texted her that she was "terrified." 
 
 Parent of Great Mills High Student Speaks 
 
 A mother who rushed to pick up her daughter after the school shooting Tuesday spoke with News4's Darcy Spencer. (Published Tuesday, March 20, 2018) 
 
 Agents of the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives went to the community to assist with the investigation. ATF agents searched Rollins home, and investigators are reviewing surveillance video from the school and looking at Rollins' social media accounts. 
 
 Gov. Larry Hogan said he was praying for the victims, their loved ones and the community. 
 
 “But prayers are not enough," he continued in a statement. "Although our pain remains fresh and the facts remain uncertain, today’s horrible events should not be an excuse to pause our conversation about school safety. Instead, it must serve as a call to action.” 
 
 Hogan praised Deputy Gaskill. 
 
 "It sure sounds like this is exactly how it should have been handled," Hogan said. "Had a very capable school resources officer that also happened to be a SWAT team member. This is a tough guy, who apparently closed in very quickly and took the right kind of action and I think, while it's still tragic, he may have saved other people's lives." 
 
 Maryland's Senate joined the House Monday night to ban bump stocks, which enable a semi-automatic rifle to mimic a fully automatic weapon. 
 
 School Shooting Incidents Since 2013 Everytown.org defines the incidents mapped below as any time a firearm discharges a live round inside or into a school building or on or onto a school campus or grounds, as documented by the press and, when necessary, confirmed through further inquiries with law enforcement or school officials. Incidents in which guns were brought into schools but not discharged are not included. Source: Everytown.org 
 
 Last updated on May 18, 2018 
 
 President Donald Trump was made aware of the shooting, and the White House is monitoring the incident, press secretary Sarah Huckabee Sanders said on Fox News. 
 
 
 
 The shooting comes four days before the national March for Our Lives, a rally for student safety inspired by last month’s massacre at Marjory Stoneman Douglas High School in Parkland, Florida. 
 
 "We are Here for you, students of Great Mills," Parkland student activist Emma Gonzalez tweeted, adding, "together we can stop this from ever happening again." 
 
 Just days ago, students at Great Mills High walked out of class to protest gun violence, The Bay Net reported. 
 
 Teens Lie Down Outside White House, Demand Gun Law Changes 
 
 "After the walkout, this happens," one student said. "It's like there was no point of the walkout." 
 
 Threats of a possible shooting at the school were investigated last month and found to be "not substantiated," the principal said. 
 
 Principal Jake Heibel told parents that school officials interviewed two students in February who were overheard mentioning a school shooting and found that they posed no threat. 
 
 But Heibel said the school still increased its security after social media posts about a possible school shooting "circulated quite extensively." 
 
 Student Witnessed Shooting at Md. High School 
 
 Student Terrence Rhames, 18, witnessed the shooting at Great Mills High School in Maryland as he waited for his first class to start Tuesday morning. (Published Tuesday, March 20, 2018) 
 
 Rep. Steny Hoyer, the Democrat who represents the area in Congress, said he was sickened to hear the news about the shooting and advocated for universal background checks for weapons. 
 
 "Background checks just make common sense to make sure people can and will use a weapon thoughtfully and not dangerously," he told News4. 
 
 Stay with News4 on-air and online for more on this developing story.
– The latest school shooting has left two students wounded and the gunman dead at Great Mills High School in Maryland's St. Mary's County, reports the Baltimore Sun. The shooting happened about 8am, and details are beginning to emerge: Sheriff Tim Cameron says a male student fired at a female student in a hallway, and he apparently struck her and a male student nearby, reports USA Today. A school resource officer arrived on the scene and fired at the shooter, says the sheriff, and "that stopped any further attack or assault." The unidentified gunman is dead, says Cameron, but it was not immediately clear whether it was the shots fired by the school resource officer that killed him, per the AP. The Sun lists the 14-year-old boy as being in good condition; the 16-year-old girl was said to be hospitalized in critical condition but has been stabilized. FBI agents were on the scene to assist deputies. No word yet on a possible motive.