EDMOND, Okla. (KFOR) Police in Oklahoma are investigating after a 30-year-old semitruck driver was found impaled on rebar at a construction site Monday.

According to Edmond Police, a construction worker called 911 after finding a man impaled on rebar at a construction site under a bridge near a local highway.

Edmond firefighters cut the rebar, and the man was taken to a hospital in Oklahoma City for surgery.

Police later discovered the man was the driver of a semitruck that had been stopped by the Oklahoma Highway Patrol earlier in the day. During the stop, the man did not put the truck in park, causing the truck to roll into the trooper’s car, police said.

After the Oklahoma Highway Patrol impounded the truck, the man walked away from the scene, officials said.

Police are working to determine if the rebar incident was intentional or accidental. The man’s condition is currently unknown.