Two people are dead after a single vehicle rollover on Highway 2A north of Millet, Alta.

Wetaskiwin RCMP were called to the scene at 1:30 a.m. Sunday.

RCMP believe the southbound vehicle lost control and rolled into the ditch on the east side of the road.

Two of the six occupants of the vehicle were pronounced dead at the scene. Two others were taken to hospital in critical condition via STARS Air Ambulance.

The two remaining occupants have serious but non-life threatening injuries, say police.

While the investigation is still ongoing, RCMP say alcohol is believed to be a factor in the collision.