College Student, 20, Disappears During Jog, Family Insists: 'We Will Never Give Up!'

College student Mollie Tibbetts vanished while out for a jog on Wednesday night in Brooklyn, Iowa.

The 20-year-old University of Iowa student was dog sitting with her boyfriend when she decided to go for a run at 10p.m. She has not been seen or heard from since.

"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 or it would go straight to voicemail," her boyfriend Dalton Jack told ABC News.

He said how she sent him a Snapchat photo the night she disappeared.

She was last seen wearing running shorts, a black sports bra and running shoes, according to the Poweshiek County Sheriff's Office.

Hundreds of volunteers have been searching cornfields, roads and barns on Friday and Saturday in an attempt to find the missing college student.

Tibbett's cousin Emily Heaston wrote on Facebook, "There is no such thing as a silly tip or lead. We do not want any information or offers of help to slip through the cracks. We cannot share Mollie's image or story too much. Thank you to all of the volunteers and the Brooklyn community for your endless love and support."

Her aunt Kim Calderwood told TV station WOI that she is "very responsible and conscientious."

"We miss you, we're looking for you and we will never give up," she said.

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