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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, AP reported.

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% of the U.S. 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.

Travelers’ 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 canceled on Sunday as of about 2 p.m. EDT, according to the tracking site FlightAware.

The storm unleashed its full fury on Buffalo, with hurricane-force winds and snow causing whiteout conditions, paralyzing 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 43 inches (109 centimeters) at 7 a.m. Sunday.

Concerns about rolling blackouts across eastern states subsided Sunday after PJM Interconnection said its utilities could meet the day’s peak electricity demand. The mid-Atlantic grid operator had called for its 65 million consumers to conserve energy amid the freeze Saturday.