Denver police say an inmate in handcuffs and shackles was seriously injured when he jumped through a closed window in a third-floor courtroom, shattering the glass and plunging to the ground.

Police spokesman Sonny Jackson says it's not clear whether the man was trying to escape or commit suicide. Authorities haven't released his name or details of his injuries.

Jackson says the man was in court on a misdemeanor assault charge Wednesday when he jumped from the Denver City and County Building.

Fire Department Lt. Phil Champagne says the man was lying on a grate outside the building when firefighters arrived.

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