The county police watchdog is investigating an 18-year-old man who was seriously injured when he was followed by police in Bowmanville early Saturday morning.
The Special Investigations Unit said Durham Police were called to the Bowmanville Avenue and Northglen Boulevard area around 3:30 a.m.
While responding, police spotted a vehicle of interest on Bowmanville Avenue and followed it.
The SIU said the vehicle later hit a light stand in a plaza less than four kilometers from the first scene.
Three people in the vehicle were subsequently arrested by police, the SIU said. One of them was taken to hospital with serious injuries.
The SIU says three investigators and two forensic investigators have been assigned to the case.
It urges anyone with information to contact the principal investigator at 1-800-787-8529.
The SIU is called in to investigate when the police are involved in a death or serious injury.