CROTHERSVILLE, Ind. -- An Amber Alert was issued Thursday for a southern Indiana girl who has been missing since Tuesday.

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Slideshow: Missing Girl

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Police believe Katlyn Collman, 10, of Jackson County, was abducted around 4:20 p.m. Tuesday at Crothersville Community School, at the corner of Preston and Oak streets in Crothersville, around 15 miles southeast of Seymour, Ind.

Police said Thursday that she was believed to be in extreme danger.

Police said Katlyn was likely abducted by an unknown suspect, described as a tall white male, between 5 feet 8 inches and 6 feet tall, very skinny, between 18 to 20 years old with short dark hair and a fair complexion. The suspect is believed to have been driving a white Ford F-150 pickup, made in the late 1980s or early 1990s.

Katlyn is a white female, 4 feet 6 inches tall, about 120 pounds and was last seen wearing a medium light blue winter jacket, a red short-sleeve shirt and black stretch pants with white stripes. She has brown eyes and brown hair, officials said.

Anyone with information on Katlyn's disappearance is asked to contact the Crothersville Police Department at (888)58-AMBER.

Video

Watch Wednesday's Report

FBI Joined Search Wednesday

Several FBI agents joined the investigation Wednesday and interviewed family members in the search for clues in Katlyn's disappearance.

Police did not issue an Amber Alert in the case Wednesday because the situation did not meet the criteria at the time -- no one actually saw an abduction.

Her parents were convinced that she didn't run away.

"She always calls or she comes back to the house and asks if she can go again. She never just up and walks off -- never," said Katlyn's father, John Neace. "We just keep looking. Every little thing, we look, we run ... keep our hopes up," Neace said.

Anyone with information is asked to call the Jackson County Sheriff's Department at (812) 358-2141.

"I just want her home safe. I just wish she'd hurry up and come home," said Katlyn's mother, Angie Neace.