The OPP is investigating a collision that has shut down a section of the 401 in South Glengarry Township. The incident happened at 12:21am.
The OPP says a tractor trailer was travelling westbound when it was struck from behind by another tractor trailer. A third tractor trailer then hit the rear of the second.
Two male drivers were taken to hospital with non-life threatening injuries. The third male driver was taken to hospital with serious non-life threatening injuries.
The OPP continues to investigate with assistance from Traffic Collision Investigators. The section of 401 between mile marker 825 and 814 remains closed at this time.
Anyone with information is asked to call the OPP at 1-888-310-1122.