Millions of people hunkered down against a deep freeze Sunday to ride out the winter storm that has killed at least 34 people across the United States and is expected to claim more lives after trapping some residents inside houses with heaping snow drifts and knocking out power to tens of thousands of homes and businesses. The scope of the storm has been nearly unprecedented, stretching from the Great Lakes near Canada to the Rio Grande along the border with Mexico. About 60 per cent of the US population faced some sort of winter weather advisory or warning, and temperatures plummeted drastically below normal from east of the Rocky Mountains to the Appalachians, the National Weather Service said.

Travellers' weather woes are likely to continue, with hundreds of flight cancellations already and more expected after a bomb cyclone when atmospheric pressure drops very quickly in a strong storm developed near the Great Lakes, stirring up blizzard conditions, including heavy winds and snow. Some 1,707 domestic and international flights were cancelled on Sunday, according to the tracking site FlightAware. The storm unleashed its full fury on Buffalo, with hurricane-force winds and snow causing whiteout conditions, paralysing emergency response efforts. New York Gov. Kathy Hochul said almost every fire truck in the city was stranded Saturday and implored people Sunday to respect an ongoing driving ban in the region. Officials said the airport would be shut through Tuesday morning. The National Weather Service said the snow total at the Buffalo Niagara International Airport stood at 109 centimetres Sunday.

Daylight revealed cars nearly covered by 6-foot snowdrifts and thousands of houses, some adorned in unlit holiday displays, dark from a lack of power. With snow swirling down untouched and impassable streets, forecasters warned that an additional 1 to 2 feet of snow was possible in some areas through early Monday morning amid wind gusts of 40 mph. Police said Sunday evening that there were two isolated. instances of looting during the storm. Two people died in their suburban Cheektowaga, New York, homes Friday when emergency crews could not reach them in time to treat their medical conditions. County Executive Mark Poloncarz 10 more people died in Erie County during the storm, including six in Buffalo, and warned there may be more dead. "Some were found in cars, some were found on the street in snowbanks," said Poloncarz. ?We know there are people who have been stuck in cars for more than 2 days." Freezing conditions and day-old power outages had Buffalonians scrambling to get to anywhere that had heat amid what Hochul called the longest sustained blizzard conditions ever in the city. But with streets under a thick blanket of white, that wasn't an option for people like Jeremy Manahan, who charged his phone in his parked car after almost 29 hours without electricity.

(With inputs from agencies)