Four people, two of whom are in critical condition, were taken to hospital after a crash Sunday morning in Coquitlam, B.C.
B.C. Emergency Health Services says they received a call for a collision on Highway 1 near Brunette Ave.
A spokeswoman says four patients were treated at the scene.
Two were taken to hospital in critical condition, while the other two were taken in stable condition.
The Ministry of Transportation and Infrastructure says the incident has the on and off ramps, as well as the overpass, closed at the Brunette exit.
The affected ramps and overpass were closed for several hours on Sunday due to the crash.
The Independent Investigations Office says it's looking into the incident because an officer was conducting radar speed detection on the highway at the time.
"They observed a grey Dodge Charger allegedly speeding and attempted to conduct a traffic stop," the IIO said in a news release.
"The vehicle did not stop and exited the highway at Brunette Avenue, where it collided with another vehicle."