Westbound lanes of Hwy. 401 are closed in Oshawa due to a fiery crash involving a tractor-trailer early Monday morning.

The OPP closed all lanes in both directions between Ritson and Harmony Rds. around 4:15 a.m. after at least one car and a tractor-trailer collided in the westbound lanes, catching fire.

The eastbound lanes were also closed, but reopened an hour later.

No injuries were reported.