Laval police are searching for witnesses following a fatal collision on Route 335.
A 27-year-old man was arrested after his car struck a street-cleaning vehicle early Wednesday.
The 34-year-old male passenger who was in the car was seriously injured and later died in hospital.
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READ MORE: Driver arrested after fatal collision in Laval
Police say they believe about 10 cars drove by the scene on Route 335 between 4:48 and 4:50 a.m., right after the collision occurred.
Anyone with information is asked to call 450-662-4636.
Police say the investigation is ongoing.