This is a developing story; we'll keep you updated.
Calderwood said the money would be paid to anyone who provides information that leads to her daughter's safe return. "We feel this is the best approach because it gives us the best opportunity to resolve this case". "Just do the right thing and let her go", he said. "I don't know that I have the strength in me, but Mollie is lending me her strength every day, every night".
Rob Tibbetts, the young woman's father, called the reward "another tool in our arsenal" to bring her home. This is going to be solved by someone coming forward with information. We're fighting like hell. Calderwood believes it's possible that someone took her daughter. "Don't compound it by dragging this out another minute".
Tibbetts has not been seen since July 18 when she went jogging in Brooklyn, the small town in Iowa where she was living.
Investigators have been looking at various data, including social media and information from a Fitbit that Tibbetts is known to have. So far, there's been no trace of her.
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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 seen wearing dark coloring running shorts, a pink shirt, and running shoes.
Poweshiek County Sheriff Tom Kriegel, Iowa Department of Public Safety Investigative Operations Director Kevin Winker and Iowa Missing Person Clearinghouse Manager Medina Rahmanovic are expected to speak.
"We're not in the position say who is a suspect, who isn't a suspect or if there are any suspects", Winker told reporters at a press conference in Montezuma.
Jack has said that he believes Tibbetts would have had both her fitness tracker and cellphone when she went out for her jog.
Calderwood said the recent weeks have felt like torture.
"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.