03/12/2012 11:22 EDT | Updated 05/12/2012 05:12 EDT

Multi-vehicle crash sends 3 to hospital

Three people have been taken to hospital, one with life-threatening injuries, after a multi-vehicle collision just north of Toronto.

The OPP say six vehicles were involved in a crash in the southbound lanes of Highway 404 at Highway 7 on Monday morning.

OPP Staff Sgt. Dave Woodford told CBC News the crash is still under investigation.

“Right now we still don’t know the sequence of events," he said. "We have our reconstruction team at the scene here mapping it out, trying to determine what occurred."

A second person suffered serious injuries.

The southbound lanes of Highway 404 reopened in the afternoon.