Two people have died and one person is seriously injured after a transport truck collided with a passenger vehicle on Hwy. 400 early Sunday morning.

OPP responded to the fatal two-vehicle collision on Hwy. 400 near Major Mackenzie Drive around 3:45 a.m., police said .

Following the collision, two occupants of the passenger vehicle were pronounced dead at the scene, while a third occupant was rushed to the hospital with serious injuries.

The severity of the third occupant’s injuries are currently unknown.

All northbound lanes on Hwy. 400 at Major Mackenzie Drive are closed as officers continue to investigate.

The on-ramp to the northbound lanes is also facing a “lengthy” closure, police said in an update to social media around 7:15 a.m.

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