UPDATED Friday, Nov. 2: Mark Alvarado was arrested Thursday evening and returned to the Marion County Jail, according to the county sheriff's office.

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An inmate is on the loose after walking away from the Marion County Transition Center early Thursday, deputies say.

The county sheriff's office said Mark Alvarado, 44, walked away from the facility about 6 a.m. He had been held there because of a probation violation, the agency said.

The center where he had been housed has minimum-security supervision and offers "an intermediate sanction between Jail and Probation," according to its webpage.

The sheriff's office asks anyone who sees Alvarado or knows his whereabouts to call 503-588-5032. He's 5-foot-6, weighs about 230 lbs. and has distinctive face and neck tattoos.

— Jim Ryan