A 16-year-old boy is fighting for his life after being ejected from a car that flipped over in a residential neighbourhood early Saturday.

Police are investigating a single car crash on Greencedar Circuit, near Lawrence Avenue East and Markham Road.

A Pontiac Sunfire carrying five boys, aged 15 and 16, was traveling along the residential street around 1:10 a.m. when it failed to negotiate a turn, hit a curb and flipped, police said.

It is believed that a 15-year-old was behind the wheel.

Four boys sustained serious, but non life-threatening injuries. A fifth boy, who was a passenger in the back seat, was critically injured.

He has been identified as Alan Alfred of Scarborough. Investigators said he was not wearing a seatbelt.

Alcohol is not believed to have been a factor in the collision, however speed and driver inexperience are being considered, police said.

CTV Toronto's Jim Junkin reported Sunday that the accident may have been the result of a stunt gone wrong. Known as drift racing, the stunt essentially results in cars sliding sideways at a high rate of speed.

Din Salcedo, who is Alan Alfred's godfather, said the crash bears the hallmarks of drifting.

"You can see the skid marks," he said, surveying the crash scene on Sunday, adding that the boys were trying to drive sideways.

Now, Salcedo's godson is in critical condition in hospital.

"The car went airborne, and in the process, he got ejected."