A young man is on life support after his car slammed into an apartment building in St. George de Beauce early Sunday morning.

Police say the 17-year-old driver of the Mazda Protege5 was going at least twice the 50 km/h limit when he crashed through a brick wall and drove through a bedroom.

The car didn't stop until it went through three more interior walls and into another apartment.

Louis Vaillancourt and Marie Faucher were killed in their sleep.

Police spokesman Mario Thiboutot says he's never seen anything like it.

"It's the first time I've seen this in my career, and I've been working for 25 years," said Thiboutot.

Accident investigators have measured the scene, and they are checking the car because police still don't know what caused the crash.

Police are certain the driver was alone on the street, and there are no signs of braking.

They also don't know if the driver will survive.

"We're talking about brain-death for the moment," said Thiboutot.

The building's owner, Richard Bolduc, says nobody is allowed to return to their home until the structure has been shored up.

The second-storey concrete floor is sagging because the car tore through a supporting wall.

"We will know more after the building inspectors come by," said Bolduc.