A motorist says he saw a police vehicle following a black car south of Edmonton this morning (May 6) before he heard gunshots and saw a wounded officer.
Chad Cammock says the car was driving on its rims then pulled over onto the side of the busy QE-II Highway near Leduc.
He says police vehicles surrounded the car, officers pulled out their guns and he heard about 30 to 40 shots.
Cammock says police pulled a man out of the car, and an officer appeared to be injured.
RCMP wouldn't say whether there were injuries, but have said traffic was shut down on a portion of the highway for several hours.
Alberta's police watchdog says it's investigating an officer-involved shooting, but declined to provide further details.
Alberta Health Services, which is responsible for ambulance services, referred calls to police.
