Natrona County Sheriff's Office

The Natrona County Sheriff's Office said search efforts include tracking experts, search dogs, mounted searchers and drones.

The search for an autistic Natrona County teen missing since Sunday afternoon has entered his fourth day.

Several local, statewide and federal agencies are assisting with the search.

Peterson is 5'9" and weighs 120 lbs. He was last seen wearing a red hooded sweatshirt and pajama pants.

Beginning at noon Sunday, a task force consisting of 10 city, county, state and federal agencies has been taking part in the search.

Joey was last seen wearing pajamas, possibly without shoes, in the area of Goose Creek Circle and Hat Six road in Casper.

Deputies found the driver roughly eight miles southwest of Black Mountain, the report says.

His physical description is consistent with that of the man who fell into the water on Sept. 7, authorities say.

The sheriff's office was notified regarding the incident at roughly 7 p.m. Saturday.

Barnes is described as being white, 5' 3" with brown hair and brown eyes.