An investigation is underway following a fatal accident on the downtown Ville Marie Expressway overnight.

A man was killed and two people were seriously injured in one car.

One person was seriously injured and one suffered minor injuries in the other vehicle.

All the victims are said to be in their twenties.

Provincial police say there might have been a race between the two vehicles.

The crash occured just before the tunnel and led to a rerouting of traffic.

Photo credit: Félix-Olivier Jacques Fournier