Frigid temperatures that could feel as cold as minus 30C have moved across the US east coast amid clean-up efforts after a massive winter storm that brought more than a foot of snow, hurricane-force winds and coastal flooding.
Forecasters predict strong winds and record-breaking cold air will sweep the region, from the mid-Atlantic to New England, and linger through the weekend.
The arctic blast could make temperatures feel as low as minus 15C to minus 25C from Philadelphia to Boston.
The wind chill could make it feel like minus 35C in the Berkshire hills of western Massachusetts, the National Weather Service said.
The storm began days ago in the Gulf of Mexico and first struck the Florida Panhandle. By Thursday, it was wreaking havoc as blizzard warnings and states of emergency went into effect along the Eastern Seaboard. Wind gusts hit more than 70mph in places and some areas saw as much as 18in of snow.
The storm caused school and business closures, airline and rail service cancellations or reductions and power outages, many of them restored quickly. Some ferry services even had to be shut down along the Canadian coast.
In New Jersey, high winds carried flames from a vacant building across the street to two other buildings. The flames also spread to two structures adjacent to the vacant building, damaging a total of five in Newark. Two firefighters received minor injuries.