A victim was airlifted to hospital Tuesday afternoon after a head-on collision in Markham.
The crash happened around 4pm near Warden and 16th avenues, trapping two people and injuring a third.
The victim was airlifted to Sunnybrook hospital from Buttonville airport.
Warden Avenue is closed in both directions between 16th Avenue and Carlton Road while police investigate.
Witnesses should call York Regional Police at 1-866-876-5423, ext. 7500.