Emergency crews are responding to a collision on Hwy. 400 north involving at least five vehicles.

Seven ambulances responded to the crash site. York Regional paramedics confirmed that six patients were treated at the scene, while five were taken to hospital for further care. Paramedics would not confirm the extent of their injuries.

OPP officials and Vaughan fire officials said northbound lanes of the highway were all closed between Major Mackenzie Dr. and Teston Rd. Two left lanes have since reopened, but one remains closed while crews work on the scene.

Police and fire crews have all advised drivers to avoid the highway.

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