FBI joins search for Iowa college student Mollie Tibbetts, who went missing one week ago

The FBI has joined the investigation into the disappearance of Iowa college student Mollie Tibbetts, who has now been missing for a week.

Iowa Division of Criminal Investigation spokesman Mitch Mortvedt said Tuesday that the FBI and state agents are taking over with volunteer searches called off.

"We're still asking for the public's help," Mortvedt said. "We'd like to get any information we can. The more eyes and ears we have, the better."

Mollie's boyfriend Dalton Jack tells KCRG that he received a Snapchat from her at about 10 p.m. on July 18 when she was dogsitting for him. She did not show up for work the following day.

Relatives believe earlier reports that Mollie vanished while jogging are not correct.

"I read somewhere that she was running in a cornfield. That's obviously not true," aunt Kim Calderwood told KCRG. “The run happened and then she was at the house as far as we know. I don't think she would've run in the dark."

Investigators are "leaning more and more toward something happening to her against her will," according to Mortvedt.

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Missing Iowa student Mollie Tibbetts found dead
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Missing Iowa student Mollie Tibbetts found dead
A ribbon for missing University of Iowa student Mollie Tibbetts hangs on a light post, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
This undated photo provided by the Iowa Department of Public Safety shows Cristhian Bahena Rivera. Authorities said on Tuesday, Aug. 21, 2018, that they have charged a man living in the U.S. illegally with murder in the death of Iowa college student, Mollie Tibbetts, who disappeared a month ago while jogging in a rural area. Iowa Division of Criminal Investigation Special Agent Rick Rahn said that Rivera, 24, was charged with murder in the death of Tibbetts. (Iowa Department of Public Safety via AP)
A county truck blocks a gravel road, Tuesday, Aug. 21, 2018, near Brooklyn, Iowa. Police say a body believed to be that of 20-year-old college student Mollie Tibbetts has been discovered in a rural area near where she went missing last month. University of Iowa student Mollie Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
A poster for missing University of Iowa student Mollie Tibbetts hangs in the window of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
My first experience as a best man went well🎉
You guys really thought I was gonna let a birthday pass without a selfie?😎 (posting a day after but I took it on my birthday so whatever)
Just a Hawkeye with her hot guy 💛🖤
A poster for missing University of Iowa student Mollie Tibbetts hangs on the front door of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Police say a body believed to be that of 20-year-old college student Mollie Tibbetts has been discovered in a rural area near where she went missing last month.Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
Happiest of birthdays to the person who made track bearable. Of all of the laps we ran together, the last one was the hardest (even if we made it the slowest) because we were ending quite an era😉 You are such a happy, hardworking, and genuine person, and I'm so lucky I get to call you my friend. Happy birthday my dude 😘😊
A ribbon for missing University of Iowa student Mollie Tibbetts hangs on a light post, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Police say a body believed to be that of 20-year-old college student Mollie Tibbetts has been discovered in a rural area near where she went missing last month. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
Currently wishing I was exploring water falls with best friend instead of sitting in an airport
A poster for missing University of Iowa student Mollie Tibbetts hangs in the window of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
I can't think of a caption but New York is cool
A poster for missing University of Iowa student Mollie Tibbetts hangs in the window of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
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Authorities are focusing on areas that Tibbetts has known to have gone to in the past. The FBI are hoping computer forensics will help narrow where she might be.

"This could shake out a bunch of different ways," Mortvedt said. "We are hoping and praying for the best outcome."

Dozens of volunteers had been searching for the 20-year-old University of Iowa student, but had been hindered by the farm ground.

"We're racking our brains, thinking what can we think of to tell the investigators," Calderwood told the Des Moines Register. "It's the worst thing to want to fix something you can't fix."

Tibbetts was born in California but moved to Iowa when she was in fourth grade, according to KCRG.

"You've seen her pictures. She's obviously a physically beautiful girl but she's more beautiful on the inside," Calderwood tells the station.

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