Authorities say a major highway in southern Ontario has been closed in both directions to deal with a collision involving dozens of vehicles.

Ontario Provincial Police say a stretch of Highway 400 has been closed as they respond to the scene south of Barrie, Ont.

OPP Sgt. Kerry Schmidt says dozens of vehicles are involved in the collision.

Schmidt says there is zero visibility in the area with heavy snow and blowing snow causing problems.

Barrie Fire says between 50 and 70 vehicles are involved in the collision.

There is no word yet on injuries.

Source: The Hamilton Spectator