A 22-year-old man was transported to London hospital with serious injuries in a crash between a car and motorcycle at London Road and Brock Street on Thursday evening.
Sarnia police, Sarnia fire and Lambton EMS responded shortly after 5:30 p.m.
Police say the driver and lone occupant of the car, a man in his early 20s, was not hurt.
The investigation continues, and there's no word on whether charges will be laid.
Anyone with information is asked to call Sarnia police constable Mark Berger at 519-344-8861 ext. 6156.