Hundreds of volunteers have joined police in the search for a US student who went missing while out jogging. Mollie Tibbetts, 20, was last seen in the town of Brooklyn, 50 miles west of Iowa City on Wednesday evening. Family members told WOI-TV that the University of Iowa student was dog-sitting with her boyfriend at a house before she went for a run. Relatives said the last contact they had with her was at 10pm through Snapchat. They knew something was wrong when she failed to show up for work the next day. Advertisement "This is not like her at all," said her aunt Kim Calderwood. "She's a very responsible and conscientious young woman." Image: Ms Tibbetts has been missing since Wednesday evening. Pic: Facebook Tibbetts's boyfriend, Dalton Jack, told ABC News she went for a run around 10pm. He said: "She might have a FitBit on and she might have her cellphone, but obviously we've tried just calling her but it's either off or dead so it would go straight to voicemail." Poweshiek county sheriff Thomas Kriegel said: "Everything's on the table, unfortunately. "We're hoping that she's somewhere with a friend and she'll show up Monday or Tuesday and everything will get back to normal." The search, which includes using a helicopter, has focused on barns, dirt roads and fields between Tibbetts's house and where she was staying when she was last seen. “WE JUST WANT HER HOME” - Signs like these are posted all over town here in #Brooklyn. We’ve gotten a lot of thank-you’s and hugs from residents today saying our coverage makes a difference & they’re so happy we’re telling Mollie’s story. It’ll air tonight at 10 @weareiowa5news pic.twitter.com/kF1kiLAyPJ — Angelina Salcedo (@ASalcedoNews) 20 July 2018 Investigators are working with the university to access a laptop and online accounts belonging to Tibbetts that may have an electronic footprint of her whereabouts, said her cousin Emily Heaston. "It can be slow and frustrating, but it is our best hope of securing Mollie's location," she wrote on Facebook. Tibbetts is described as 5ft 2in tall, weighs about eight-and-a-half stone, and has brown hair and brown eyes. She was last seen wearing gym shorts, a black sports bra and running shoes.<doc-sep>A new website is allowing the small Iowa community of Brooklyn to help authorities as they investigate the mysterious disappearance of Mollie Tibbetts. Tibbetts, a 20-year-old rising sophomore at the University of Iowa, vanished the evening of July 18 while jogging in Brooklyn, a close-knit, rural farming town of about 1,500 people. The disappearance was completely out of character for her, Mitch Mortvedt, assistant director of field operations for the Iowa Division of Criminal Investigations, said at a news conference Monday. The state agency has formed a task force with the FBI and the Poweshiek County Sheriff's Office to investigate. Nearly one month later, "every avenue ... is being pursued," Mortvedt said, including conducting searches and following up on all reported information. More than 1,500 tips have been received and over 500 interviews have been conducted, officials said. A reward has climbed to over $360,000. The new website -- findingmollie.iowa.gov -- allows people to submit anonymous tips, authorities said. "We are asking everyone to reflect back on the days prior to her disappearance in hopes of recalling details about any persons or vehicles in the area," Mortvedt said. "Individuals who commit violent crimes often display behavior that is recognized by those with whom they live, work, attend school or are in otherwise close relationships with." Mortvedt warned that such behavior could include: changing normal routines, changing sleep patterns, an unexplained lack of contact on July 18 or 19, unexplained injuries, getting rid of a car or unexpectedly cleaning a car. "It is often in cases like this that people may have information that they do not initially share for a number of completely understandable reasons, for example: They do not initially feel that it was important or assumed that somebody else may have already informed law enforcement," he said. "We encourage you to provide whatever information you may have." Laura Calderwood, Tibbetts' mother, told ABC News last month there were "no words to describe how you feel when you don't know where or how your child is," calling it "excruciating." One of Tibbetts' brothers, Scott Tibbetts, said he believed his sister was "fighting her best to get back home." "I think the best thing, personally, to hang onto hope is ... she's a better fighter than anyone I know," he told ABC News. "So whatever situation she's in, it's not like she's going to sit there and give up."<doc-sep>
An unconfirmed sighting of the missing 20-year-old is being investigated. There has been an unconfirmed sighting of missing Iowa jogger Mollie Tibbetts in Kearney, Missouri. Kearney police responded on July 26 to a possible sighting of Tibbetts, 20, at a truck stop in the area, police told ABC News affiliate KMBC. The location is more than 230 miles away from where Tibbetts was last seen. Officers conducted a search of the area, spoke with witnesses and reviewed any potential surveillance video. A report was sent to the investigative task force regarding the sighting, Sgt. Joe Kantola told KMBC. No other additional details of the sighting were released. Tibbetts was reported missing after she failed to show up for work in Brooklyn, Iowa, a farming community of about 1,500 people where she was living over the summer with her longtime boyfriend. At a press conference Monday, police released no specific details about new developments in the case but said the search is active. "Law enforcement and hundreds of others have devoted countless hours to the investigation," said Kevin Winker, the director of investigative operations for the Iowa Department of Public Safety. Canine searches have been used and investigators are poring over any clues they could gather from undisclosed technology, Winker said. Earlier in the investigation, officials said that they were going to be examining her Fitbit, a device that tracks physical activity and has a GPS feature. Winker said the he was "not going to draw any conclusions about the circumstances of her disappearance other than it's not consistent with her past." More than 200 leads have been collected as part of the investigation, police said. Tibbetts' father said he believes there's someone else with information that could help locate his daughter. “It doesn’t matter what we’re going through, we just need people to think -- because somebody knows something and they don’t even know it’s important,” Rob Tibbetts said. ABC News' Meghan Keneally and Karma Allen contributed to this report