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By Elisha Fieldstadt

Missouri authorities were hunting Monday for two "dangerous" inmates who escaped in the middle of the night and may be headed over state lines.

Matthew Miller, 22, from Eagle Rock, Missouri, and Keith Davis, 24, from Anderson, Missouri, escaped from the McDonald County Detention Center by climbing through a shower wall and into a maintenance facility that had access to the outside, McDonald County Sheriff Michael Hall told NBC News.

Mugshots of Matthew Miller, left, and Keith Davis who escaped from the McDonald County Detention Center in Pineville, Missouri.

Hall said investigators believe the inmates stole a van and two dirt bikes and were headed to Springdale, Arkansas, because a van stolen near the jail was spotted in the city, about 40 miles south of McDonald County.

Both are wanted for escape, stealing and assaults, according to a statement from the McDonald County Sheriff's Office. The statement warned the public that the escapees are "considered dangerous."

This is a developing story. Please refresh for updates.