At least 63 killed in deadly blizzard wreaking havoc across U.S.

The death toll from the historic blizzard across the United States climbed to 63 on Tuesday, as record snowfall blocked roads, hindering rescue operations, officials said.

Confirming seven additional fatalities in Buffalo, Mayor Byron Brown said on MSNBC's "Morning Joe," that the storm was "probably worse than anything that this city has seen in over 50 years."

Despite a driving ban in force in parts of the Buffalo area, "we still are finding a lot of people out and about just hampering our efforts as first responders," the city's Public Works Commissioner Nathan Marton said Tuesday morning on NBC News Now, adding that the department was trying to clear at least one lane for emergency vehicles.

"We need people to continue to stay patient, stay off the roads today, and as soon as we can, we will lift the driving ban in the city of Buffalo,” said Brown.