Three truck drivers were injured early Tuesday morning when three tractor-trailers collided on Highway 401 in South Glengarry.
One trucker suffered serious non-life-threatening injuries while two others sustained non-life-threatening injuries.
The crash occurred between mile marker 825 and mile marker 814.
The preliminary investigation has indicated that at 12:21 a.m., a tractor-trailer was travelling westbound on Highway 401 when, for reasons under investigation, was struck from behind by another westbound tractor-trailer. A third tractor-trailer struck the rear of the second tractor-trailer.
The Stormont-Dundas-Glengarry Ontario Provincial Police detachment continues to investigate with the assistance of OPP Traffic Collision Investigators.