Missing student's mother pleads with potential abductor

Poweshiek County Sheriff Tom Kriegel, Iowa Department of Public Safety Investigative Operations Director Kevin Winker and Iowa Missing Person Clearinghouse Manager Medina Rahmanovic spoke at the event.

The police presence is between Guernsey and Deep River.

According to police, officers responded to a possible sighting of 20-year-old Mollie Tibbetts on Thursday, July 26, at a truck stop in their jurisdiction.

On Thursday, investigators once again searched fields and ditches near Brooklyn, Iowa, where the 20-year-old vanished more than two weeks ago.

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"It is our greatest hope that if someone has her, that they would just release her and claim that money we have raised for her freedom", Tibbett's mother Laura Calderwood said at a press conference Thursday.

Police in Kearney, Missouri, said an employee at a truck stop reported Sunday that she saw someone resembling Tibbetts eating at a Taco Bell.

Tipsters can call Crime Stoppers of Central Iowa at 800-452-1111 or 515-223-1400.

Investigators have been looking at various data, including social media and information from a Fitbit that Tibbetts is known to have. Investigators are still trying to determine why she disappeared.

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At a press conference Monday, police released no specific details about new developments in the case but said the search is active.

"Mollie was a friend to everybody", said Kim Calderwood, her aunt.

Tibbetts was studying psychology and wanted to get a doctorate and write books, her father said. She was last seen wearing dark-colored running shorts, a pink sports top and running shoes of an unknown color. Winker says investigators are pursuing every possible lead but haven't determined why Tibbetts went missing on July 18.

"It certainly helps in that we are able to help establish a timeline and that's certainly critical for any investigation like this", Rahn told ABC News in an interview last week. "There wasn't anybody that she wouldn't bring into her world with love".

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