Mollie Tibbetts' parents and boyfriend had a direct message for possible kidnappers at a press conference Thursday morning. She called Tibbetts an "incredibly strong woman".
Authorities say they've followed up on more than 200 leads related to her disappearance.
At a press conference Monday, police released no specific details about new developments in the case but said the search is active.
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The clothing item was reportedly found by a person mowing the lawn near the Lincoln Wildlife Reserve, which is in the same area as a pig farm searched by FBI investigators last week for almost two hours.
In partnership with the Crime Stoppers of Central Iowa, the family set up the "Bring Mollie Tibbetts home safe reward fund" for any information, which can be given anonymously, for the University of Iowa student's safe return. "We believe that Mollie is still alive, and if someone has abducted her, we are pleading with you to please release her", she said.
Police in Kearney, MO said an employee at a truck stop reported Sunday that she saw someone resembling Tibbetts eating at a Taco Bell. "We are told very little by the authorities for very good reason", he said, noting how police are hesitant to share information with anyone who could be connected to the case. That effort included sifting through data from her cellphone, social media accounts and a Fitbit, a physical activity tracker.
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Jack has said that he believes Tibbetts would have had both her fitness tracker and cellphone when she went out for her jog. Her disappearance has gained national attention.
Kevin Winker, investigative operations director for the Iowa Department of Public Safety, said he knows the tight-lipped approach is frustrating for people who are eager to know what happened to 20-year-old Mollie Tibbetts.
"If they're listening then I would just like them to know... imagine if this was you". 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.
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