A manhunt is underway in Arkansas after a former police chief escaped from a prison in Calico Rock on Sunday afternoon.

Grant Hardin, the former chief of police in the town of Gateway, was serving a lengthy prison sentence after being convicted on rape and murder charges.

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He was discovered missing from his prison cell around 3:40 p.m. Sunday, according to a statement from the Arkansas Department of Corrections.

The Stone County Sheriff's Office said Hardin is "considered extremely dangerous and should not be approached."

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