All westbound lanes of Highway 401 Express at Keele Street are closed following a collision.

The OPP says the crash involved a person and a vehicle.

At this time, police cannot confirm the circumstances surrounding this collision.

Police and emergency services are now at the scene.

This investigation in ongoing.

Drivers are being advised to avoid the area and follow the directives of officers at the scene.

More details to come. This is a developing story.