Teacher:In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Teacher: Now, understand the problem? Solve this instance: BROOKLYN, Iowa — The father of missing Iowa college student Mollie Tibbetts says he believes his daughter may have left willingly with someone she knew. Tibbetts, 20, was last seen taking her daily jog nearly three weeks ago. 
  
 "I think someone went to the house that Mollie knew or that Mollie trusted and that she left with them willingly," Robert Tibbetts told CBS News correspondent Adriana Diaz. "Now they're in over their head and they don't know what to do." 
  
 Tibbetts' family describes her as a light, who loves to lift others. Her personality is on display in a 2016 video, where she's seen addressing her peers at a faith event. 
  
 "Everyone has their own talent, whether it's a sport you're good at or if you're good at dance or if you're a great writer, or even if you're just a good person -- that's one of the best things you can be good at," she says. 
  
 Tibbetts' parents got a call on Sunday that they'd been dreading. Investigators found a body, but they couldn't confirm that it was their daughter. 
  
 This undated photo released by the Iowa Department of Criminal Investigation shows Mollie Tibbetts. Iowa Department of Criminal Investigation via AP 
  
 "The FBI agent called us and she told me I don't want you to hear this on the news," said Laura Calderwood, Mollie Tibbetts' mother. 
  
 Investigators soon announced the body was not Tibbetts, but of 20-year-old Sadie Alvarado who was found on the side of a road in Lee County, Iowa. 
  
 "We immediately, when we found out, thought about that family and the tragedy that they went through, and this in no way diminishes their pain," said Robert Tibbetts. 
  
 Wayne Cheney, who lives near the search area, says he's been questioned by the FBI at least five times about Tibbetts. The former hog farmer has several convictions including stalking and harassment, and charges in seven other cases have been dismissed. 
  
 He told Diaz someone from the FBI wanted him to take a polygraph test. 
  
 "I said 'No, I'm not doing it,'" he said. 
  
 Tibbetts is one of more than 88,000 active missing persons cases in the U.S. Her search continues to make national headlines. Brooklyn, Iowa is plastered with her face, which is even on billboards outside the state. The outpouring of support has touched Tibbetts' parents. 
  
 "I think it's because people see in Mollie their own daughters, their own girlfriend, their own sister," Robert Tibbetts said. 
  
 "I think it struck a chord with people that, you know, this could be happening to me right now, to my family," Calderwood said. 
  
 Mollie is more than Robert Tibbetts' daughter. At his wedding earlier this year, she was his best man. He says if he could talk to his daughter, he would tell her to "hang on." 
  
 "We're gonna come get you," he said. "Everybody's looking." 
  
 Police have still not identified any suspects or made any arrests in the case. CBS News spoke with Tibbetts' boyfriend, who says he's also been questioned by investigators but is not a suspect. A reward for information about the case is now more than $277,000. ||||| The father of missing University of Iowa student Mollie Tibbetts said on Monday that he believes his daughter may be with someone who misunderstood her intentions and created a situation that's spiraling out of control. 
  
 Interested in Mollie Tibbetts? Add Mollie Tibbetts as an interest to stay up to date on the latest Mollie Tibbetts news, video, and analysis from ABC News. Add Interest 
  
 "It's totally speculation," Rob Tibbetts told ABC News, "but I do believe that Mollie is with someone who she knows, probably someone who cares about her. But that relationship was misguided, misinterpreted and went wrong, and I think they're in a place with Mollie and don't know how to get themselves out of this horrible situation." 
  
 Rob Tibbetts said that as the search for Mollie continues, it's also important to give that individual "the freedom and the space to process this, and to get themselves out of this amount of trouble before they get into a deeper amount of trouble." 
  
 His daughter's kindness, compassion and outgoing personality may have simply given someone the wrong idea, he continued. 
  
 "I do really believe that what happened to Mollie wasn't that someone set out to harm her," Rob Tibbetts said. "I think because they haven't found Mollie, that Mollie is still some place, and we can get her home." 
  
 WOI 
  
 The 20-year-old Tibbetts went missing July 18. 
  
 Hundreds of thousands of dollars have been donated to establish a reward fund to help bring her home. Since Thursday, Rob Tibbetts said, almost 500 new leads and tips have surfaced, thanks to local authorities and to Crimestoppers. 
  
 Facebook 
  
 Mollie Tibbetts, a rising sophomore, was living in Brooklyn, Iowa, with her boyfriend, Dalton Jack, when she went for a jog and hasn't been seen since. 
  
 Her story, according to her father, has "struck a chord" with so many because "everyone has a daughter or a sister or a girlfriend like Mollie." And her disappearance "is so random and senseless and scary that people have adopted Mollie and her story." 
  
 When asked what he would say to anyone who may have taken her, Rob Tibbetts responded: "You've made a mistake. We've all made mistakes. Don't compound this. Work your way through this. Listen to Mollie." |||||
Student:
The family of missing Iowa college student Mollie Tibbetts hasn't really wavered on its position that they believe the 20-year-old is alive. On Tuesday, father Robert Tibbetts shared his theory on what may have happened with CBS News: He thinks Tibbetts may know whomever she's with. "I think someone went to the house that Mollie knew or that Mollie trusted and that she left with them willingly. Now they're in over their head and they don't know what to do." He made similar comments to ABC News: "It's totally speculation, but I do believe that Mollie is with someone who she knows, probably someone who cares about her. But that relationship was misguided, misinterpreted, and went wrong." More on the case: CBS News offers one other touching detail about Robert's close relationship with his daughter: Tibbetts served as his best man when he married earlier this year.