An inmate at the Sterling Correctional Facility in Colorado has escaped from prison on Sunday, the Colorado Department of Corrections has confirmed.

48-year-old Douglas J. Alward, an inmate convicted of attempted murder, was last seen at around 9 in the evening and was nowhere in sight during the roll call an hour later.

Katherine Sanguinetti, a spokeswoman for the Department, warned that the escaped man “should be considered dangerous.”

Alward is a white man with a shaved head, stands 6 feet and 1 inch tall, and weighs 152 pounds. He is serving 20 to 40 years in jail for convictions on charges of attempted murder, burglary, kidnapping and assault.

The Department of Corrections declined to go into details on how Alward got out of the correctional facility, but informed the people living around the area via an emergency notification system to look out for a man wearing a “dark green prison-issue clothing or gray sweats and a white shirt.”

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