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Police continue to investigate an ATV collision in rural Thunder Bay early Sunday morning.

Thunder Bay Police said an ATV rolled over at the intersection of Candy Mountain Road and Oliver Creek Road shortly after 1:00 am.

Both the driver and passenger were injured and sent to hospital by ambulance. A media release on Sunday morning said a male was in critical condition and a female was being treated for non-life threatening injuries.

The intersection remained closed to traffic for a number of hours.