The north-eastern US states of New York, New Jersey, Pennsylvania and Virginia have declared states of emergency as a huge winter storm sweeps in, bringing heavy snow.
With winds of up to 100 kms per hour, the storm is expected to cause severe disruption for commuters across many parts of the north-east.
In all, about 50 million people across the country have been warned about the severe weather.
The US National Weather Service issued blizzard warnings from eastern Pennsylvania to south-west Maine.