Calgary police say some of the teenagers involved in a fatal crash on Blackfoot Trail Saturday night had just arrived in Canada three days ago -- and none were wearing seatbelts.

The 19-year-old driver was pronounced dead at the scene of the crash while three other teens were taken to hospital. Investigators say at least two of the car's occupants were brothers.

According to witnesses the young man behind the wheel was driving erratically and speeding, going 120 kilometres per hour in an 80 kilometre per hour zone.

It also appears the vehicle was being driven erratically between other vehicles and changing lanes before losing control and slamming into a sign on the driver's side.

Police say the road was extremely slippery at the time and evidence suggests no one in the car was wearing a seatbelt.

Investigators say the teens were coming from a Middle Eastern cultural event and had only just arrived in Canada.

"We have a close-knit group of people who were at a community event, they're all touched by this tragedy," said Sgt. Dan Kurz. "Definitely we have one family that's been torn apart. They've lost a family member and we have some other people who from our information have just arrived in Canada to start a new life and now they have this to step over."

Officers are working to try and communicate with grieving family members and witnesses, many of whom don't speak English.

Alcohol is not being considered as a factor in the crash.