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LANSING, Kan. — A manhunt is underway Monday after an inmate escaped the Lansing Correctional Facility.

The Lansing Police Department said 36-year-old Cal Henry Green was last seen operating a military surplus 2-1/2 ton truck bearing the Kansas license plate number 16445.

He is described as 5-foot-4, weighing about 200 pounds. He was last seen wearing blue jeans and a blue t-shirt.

Green wasn’t on a work release program but had a job inside of the prison. He was last seen around 11:45 a.m. Officials said around 1:20 p.m. the warden ordered an emergency head count, and that’s when they realized Green was gone.

Officials said he should be considered dangerous. The KCK native has been in and out of prison and jail since 2000 for charges such as forgery, burglary and, most recently, aggravated battery causing great bodily harm. That’s why he’s spent just over four years at Lansing Correctional Facility.

Anyone with information is asked to call 911, the Kansas Department of Corrections at 913-240-0639 or KBI at 1-800-572-7463.

Lansing USD 469 Superintendent Darrel Stufflebeam tells FOX4 an email and text has been sent to parents informing them that schools were on lockdown. Children were released after the final bell however.

This is a developing story. FOX4 will continue to keep you updated as additional details become available.