Highway 401 has closed in both directions east of Oshawa in Clarington due to a large fire that has sent smoke to the highway.
Passersby began sharing images of heavy smoke coming out of the scene around 6:30 p.m.
Durham police confirmed the teams were responding to a fire in Courtice Court, in the area of Courtice Road and Baseline Road West.
It is still unclear what exactly is burning or how the fire started. Police said a media officer will provide more details later in the evening.
At the moment there is no word on possible injuries.
Highway 401 has been closed in both directions between Harmony Road in Oshawa and Highway 418 due to the fire, Ontario provincial police said in a tweet. The southbound lanes of Highway 418 are also closed between Regional Highway 2 and Highway 401.
It is unclear how long the closure will last.