DES MOINES, Iowa - For two weeks, investigators have been searching for clues and conducting hundreds of interviews in the search for Mollie Tibbets. But it's still unclear what happened to the missing University of Iowa student.
In July, police in southern Utah asked residents to be on the lookout for Tibbets, who they said has family connections in southern Utah.
Her family and friends are posting flyers, talking to people and doing media interviews to spread awareness about the 20-year-old.
On Thursday, her family and Crime Stoppers of Central Iowa are holding a press conference to discuss the case.
When asked whether he had a message for his missing daughter, her father, Rob Tibbetts told HLN, CNN's sister network, "Just hang in there, pie. We're fighting like hell... We'll find you."
Tibbetts disappeared on July 18, in Brooklyn, a small community an hour east of Des Moines, according to the Poweshiek County Sheriff's Office.
More than 200 interviews have been conducted in the investigation into her disappearance, said Richard Rahn, the special agent in charge with the Iowa Division of Criminal Investigation for the Major Crime Unit, earlier this week.
Investigators have been looking at various data, including social media and information from a Fitbit that Tibbetts is known to have.
"It's intolerable. No one just disappears, no one just vanishes without a trace," her father told HLN.
Tibbetts was studying psychology and wanted to get a Ph.D. and write books, her father said.
On July 18, the day she disappeared, Tibbetts' brother dropped her off at her boyfriend's house so she could dog-sit, HLN reported. She was last spotted jogging around 7:30 that evening, wearing gym shorts, a black sports bra, and running shoes, the sheriff's office said.
Investigators have constructed a timeline they feel confident about.
"The timeline is very important, obviously, to us, but it's also been very important to us to get to know Mollie and understand what's normal for Mollie, what's not normal for Mollie," Kevin Winker, director of investigative operations for the Iowa Department of Public Safety, said on Tuesday.
When asked if authorities suspect that Tibbetts was abducted, Winker said: "We don't know where Mollie is at right now. And I am not going to draw any conclusions about the circumstances of her disappearance. Other than it is not consistent with her past."
Her mother, Laura Calderwood, said the recent weeks have felt like torture.
"The first night she went missing, I was distraught," Calderwood told CNN affiliate KCCI. "I knew her phone was dead, but I sent her a text saying, 'I love you. We're looking for you. We will find you no matter what.'"