At least five people were killed after a major winter storm pounded the US East Coast on Friday, with strong winds, heavy rain and snow disrupting thousands of flights and forcing the closure of federal government offices in Washington.

Coastal flooding alerts were issued from New Jersey to Massachusetts with winter weather advisories, winter storm warnings and high wind warnings in effect from the Northeast to the Mid-Atlantic, the National Weather Service said.

Winter Storm Riley dropped more than a foot (30.5 centimeters) of snow in the western and northern parts of New York state, as heavy rain lashed coastal areas. The storm is expected to taper off overnight or by early Saturday.