Three people were killed and one critically injured whena Greyhound bus rolled in northwestern Alberta early Tuesday morning, trapping some passengers beneath it, RCMP officials said.

Those killedwere a 72-year-old woman,a 20-year-old woman and her five-month-old son.


A Greyhound bus and its trailer rolled in a ditch, killing three people. Road conditions were slippery with ice and snow, say police. ((Randy Vanderveen/Canadian Press))

The RCMP said thebus, carrying 28 passengers and one driver,rolled off an icy highway into a ditch at6:20 a.m. MT Tuesday near Bezanson andabout 50 kilometres east of Grande Prairie.

RCMP Const. Scott Hagarty said some of the passengers were pinned underneath the bus.

"It is possible they were ejected though the bus window," Hagarty said. "They had to be extricated by the fire department."

Hagarty saidthe 26 surviving passengers weretaken to a Grande Prairie hospital.

In an update Tuesday afternoon, RCMP said one person remained in critical condition and threewere in serious but stable condition.


The bus crash happened on Highway 43, near Bezanson, Alta., about 50 kilometres east of Grande Prairie. ((CBC))

Greyhound spokesman Dave Hickie saidthe busleft Edmonton at midnight for Grande Prairie.

Hickie said the driver had been with Greyhound for a year, butcouldn't sayhow much driving experience he had before being hired.

The RCMPsaid ice and snow on Highway 43 might have been a factor in the rollover.

"It's a bit of traffic mayhem up there in terms of the road conditions," said Bart Goemans, spokesman for STARS air ambulance.

Officials set up a phone line at(780) 538-7541 for friends and family to call.

In May 2005, six people died when a semi-trailer strucka charteredbus full of oilfield workers that had become stuck trying to turn around on a two-lane highway outside Edmonton.

In August 2005, two people were critically injured when a Greyhound bus collided with two large trucks in heavy fog east of Grande Prairie.

With files from the Canadian Press