An emergency response plan is now in place after a massive tractor-trailer pileup on Highway 401 near Trenton on Wednesday morning.
Ontario Provincial Police (OPP) said the crashes involve between 30 to 40 tractor-trailers, as well as other vehicles.
The OPP said all eastbound lanes of the 401 are closed along a 30-kilometre stretch of the highway from Brighton to west of Belleville. All but one westbound lane was closed as well, but the lanes have since reopened.
— OPPCommunicationsER (@OPP_COMM_ER) March 18, 2015
Officials with the Ministry of Environment are on scene for a leak of some kind. Reports from the scene indicate one of the tractor-trailers was carrying more than 40,000 litres of oil.
Police said the crashes, which were weather-related, occurred in the eastbound lanes around midnight.
Four people were taken to hospital with non-life-threatening injuries.
While it is not clear what the weather conditions were like at the time, whiteout conditions were reported just after midnight on Wednesday.
Highway 2 is being used as an alternate through the area.