A mountain biker was reported missing in Oregon after not returning home from a biking trip in Mount Hood, according to authorities.

Ralph Sawyer, 52, was reported missing on Friday around 10:30 p.m. – two hours after he was expected to return home after leaving that morning for a mountain biking trip, the Clackamas County Sheriff’s Office wrote in a news release.

A search and rescue mission was immediately launched to locate him, the sheriff’s office said.

The search for Sawyer has been centered along East Still Creed Road to Veda Lake and Kinzel Lake, along with the U.S. Forest Service roads around Trillium Lake. (Clackamas County Sheriff’s Office)

An Air Force Reserve Command combat search and rescue unit and K9 units were deployed on Monday in addition to the groups involved in search efforts over the weekend.