REDDING, Calif. (AP) — A father and son are expected to face federal kidnapping charges after they zip-tied two U.S. Forest Service employees and held them at gunpoint inside a trailer in Northern California near Mt. Shasta.

Forest Service Chief Tom Schultz said the two workers were conducting routine field operations in the Shasta-Trinity National Forest when they were taken Thursday. They were released early Friday morning after being held for more than 12 hours near Gunboot Lake.