Parts of Buffalo, New York, were buried in up to 5ft of snow
A fierce storm is bringing more snow to parts of the US north-east, with officials warning residents to be prepared for 3ft (1m) of new snow.
New York Governor Andrew Cuomo called it a "historic event", while a local official dubbed the storm "gigantic".
Some places, including the city of Buffalo, are already underneath 5ft of snow, and eight people have died in New York state.
Weather-related deaths were also reported in New Hampshire and Michigan.
Freezing temperatures have continued in many parts of the US, with heavy disruption to travel.
The new storm blast spread across New York early on Thursday, bringing thunder, lightning and the spectre of several more feet of snow.
"It's a force of nature, a massive force of nature,'' Deputy Erie County Commissioner Richard Tobe told reporters.
"We're prepared, but the storm is gigantic and persistent."
ABC's Gio Benitez told the BBC that Buffalo is braced for yet more snow
John Jiloty of East Aurora near Buffalo told the BBC that some people had been stuck in their cars for a day and a half.
"I'm lucky to not be in some of the worst of it where there's six feet of snow literally 15 minutes away from where I am," he said.
"We have maybe four feet of snow so a couple more coming tonight and we'll see how we do."
Analysis: Emma Boorman, BBC weather forecaster
Some parts of New York state have had about 5ft of snow, and there is more to come, perhaps as much as another 2ft in some places.
The situation is not unheard of for this time of year, but it is a little unusual. Cold air has pushed south and moved over the relatively warm Great Lakes area - this increases the temperature contrast between the water and the air, which leads to vast and persistent snow showers.
There is an end in sight. It will turn milder through the weekend with a rapid thaw developing - perhaps leading to its own problems with flash flooding.
Residents were reported trapped in their homes and cars, and strong winds and icy roads caused motorway accidents and forced school closures in parts of the US.
More than 100 National Guard members were deployed in New York to assist in clearing roads and removing abandoned vehicles.
Train services in parts of New York state were suspended into Thursday, while long stretches of road near Buffalo were closed.
On Thursday, Mr Cuomo told reporters it would be "impractical" to go ahead with a US football game hosted by the Buffalo Bills on Sunday.
The National Football League has yet to announce whether the game will be postponed or relocated.
Several sports games were called off as snow covered stadiums across the northern US
Hundreds of vehicles remain stranded
As well as the fatalities in New York, two other weather-related deaths were reported in New Hampshire and Michigan.
About 20 people have died across the US since Saturday.
Three firefighters in Indiana were also injured when a trailer struck a fire truck on a snow-covered road.
"We are talking about a very dangerous storm"
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