All lanes of Highway 7 in Pickering are open to traffic again, after a six-car pileup on Tuesday afternoon left four people hurt, including a man suffering life threatening injuries.

Police say at around 3:51 p.m. a Dodge Caravan travelling westbound on Highway 7, east of Concession 6, crossed into the oncoming lane of traffic. The Caravan collided with a Hyundai Elantra. Afterwards, four more vehicles became involved in the collision.

In a release Ontario Provincial Police said the driver of the Dodge Caravan, a 49-year-old man from Maple, Ont., suffered serious but non-life-threatening injuries. The driver of the Hyundai, a 30-year-old man from Whitby, Ont., has been taken to hospital with life-threatening injuries. Two other drivers, a 49-year-old woman, and 27-year-old woman, were taken to hospital with minor injuries.

Any witnesses to the collision or anyone with information is asked to contact the investigating officer, Const. Gavin Cox, at the Whitby OPP Detachment at 905-668-3388.