Prison officials say three inmates have escaped from a northwest Arizona prison.

Helicopters and K-9 units joined the search for the men, who were discovered missing Friday evening from the Arizona State Prison in Golden Valley. The men are considered dangerous.

The missing prisoners are:
-- Tracy Province, who was serving a life sentence for murder and robbery;
-- Daniel Renwick, who was serving 22 years for second-degree murder; and
-- John McClusky, who was serving 15 years for second-degree murder, aggravated assault and discharge of a firearm.

Anyone with information on the escaped prisoners should call policei mmediately. They were last seen wearing orange prison jumpsuits.