New York covered in snow and bracing for more

Pictures of New York City in the grip of the snow storm plaguing north-east America have emerged as the metropolis braces for a "polar vortex".

Read more: US temperatures set to plummet to record lows in 'polar vortex'

City leaders declared a state of emergency as a snow storm dubbed "Hercules" sweeps across the north east of America.

Storm Hercules dumped 21 inches of snow on Boxford, just north of Boston, by Thursday night, according to the National Weather Service.

Read more: At least 16 deaths blamed on US winter storm

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US temperatures set to plummet to record lows

Parts of America and Canada are experiencing near record-breaking low temperatures from a severe winter storm that has claimed at least 16 lives.