One person is dead and four others injured after a four-vehicle crash on Highway 400 North of Toronto Monday morning.
The Ontario Provincial Police say their investigation into the crash will include whether the weather conditions were a factor.
"The weather will be one of the considerations when investigating this collision. However, it's too early in the investigation to know for sure if weather was the cause," Ontario Provincial Police Constable Linda Wolf said Monday.
Four others were injured in the crash. One person was airlifted to hospital with life-threatening injuries, while the other three were transported by ambulance.
Whether weather proves a factor or not, Wolf warned drivers to keep the changing weather in mind for their morning commutes.
She noted temperatures have dropped, and said drivers needed to be prepared for slick roads, ramps and bridges.
"They must take extra precautions, just go a little slower, and remember they may not be able to see that the roadway is slick," she said. "Just slow down."
The collision happened at 7:30 a.m. in the King City area Monday morning, and shut down the highway for several hours. It was reopened later in the morning.
With files from the Canadian Press