UPDATE 10 a.m. Tuesday: Both Castro and Wellknown have been apprehended.
Authorities are searching for two men who walked away from the Helena Prerelease Center on Monday.
Emery Thomas Castro, 25, and Clayton Lee Wellknown, 34, failed to report to work on Monday.
Castro, serving a 36-month sentence for partner or family member assault, is described as Native American, 5 feet 8 inches tall, 135 pounds with brown hair and brown eyes.
Wellknown, serving a 36-month sentence for criminal possession of dangerous drugs, is described as Native American, 5 feet 7 inches tall, 165 pounds with brown hair and brown eyes.
Authorities ask that anyone with knowledge of their whereabouts contact their local law enforcement.