At least 25 people have died in the US as the historic Storm Jonas continues to wreak havoc across the east coast.

The blizzard has brought more than 2ft (60cm) of snow, causing 12 states to declare a state of emergency.

Heavy snow caused Washington DC to declare a "snow emergency", closing its transport system over the weekend, and New York City banned all road travel, cancelled bus services and shut overground parts of the subway.

In Washington, 22.2 inches of snow were recorded, with 26.8 inches recorded in New York City - just 0.1 inches short of the 2006 record.

Fourteen people were killed in weather-related car crashes, four while shoveling snow, two died of hypothermia and one died when he became trapped in his running car by a snow plough.

How to survive storm Jonas

Authorities have said a US Capitol police officer - Vernon Alston - has died after shoving snow at his home in Delaware.

His widow, Nicole Alston, said her husband had collapsed on Saturday afternoon outside their home in the tiny town of Magnolia after shoveling snow for an hour.

He was reportedly dead within minutes.

An elderly couple in South Carolina died of carbon monoxide poisoning from a generator they had used after they lost power on Friday.

A 23-year-old woman and her one-year-old son are also believed have died from carbon monoxide in New Jersey after sitting in a running car with its tailpipe covered in snow.

The woman's three-year-old daughter is in hospital in a "very critical condition".

Warm, moist air from the Atlantic Ocean collided with cold air to form the massive weather system.

Blizzard hits US east coast - in pictures Show all 10 1 /10 Blizzard hits US east coast - in pictures Blizzard hits US east coast - in pictures Storm Jonas from space This image taken by NOAA's GOES-East satellite on 22 January and released by NASA shows a winter snowstorm over the east coast of the United States. NOAA GOES Project/NASA via AP Blizzard hits US east coast - in pictures Washington Monument covered in snow A jogger runs past the Washington Monument as snow falls in Washington DC. The US capital is expected to be one of the worst affected areas during the blizzard conditions. Win McNamee/Getty Images Blizzard hits US east coast - in pictures Record snowfall disrupts traffic Snow slows down traffic on Interstate 40 in Nashville, Tennessee. At least seven people have been killed in traffic accidents due to the bad weather. Andrew Nelles/The Tennessean via AP Blizzard hits US east coast - in pictures Washington DC faces worst of the snowfall A member of the US Secret Service stands guard covered in newly fallen snow outside the White House. Win McNamee/Getty Images Blizzard hits US east coast - in pictures Supermarkets stripped of essentials Supermarket shelves were left bare as millions of Americans hunkered down for a winter storm expected to dump historic amounts of snow in the eastern United States. NICHOLAS KAMM/AFP/Getty Images Blizzard hits US east coast - in pictures New York braces for blizzards A New York City police officer of the 20th District use snow blowers to clean the pavements at West 81st street on January 23 2016 in New York City. Astrid Riecken/Getty Images Blizzard hits US east coast - in pictures Snow covers US capital A pedestrian crosses the street in the Chinatown area of Washington DC. Some areas of the Washington district are expected to see more than 100cm of snowfall. Getty Blizzard hits US east coast - in pictures Snow covers US capital Workers shovel snow on a sidewalk in Washington DC. The storm could potentially be the largest in the capital’s history and will probably rank in the top five in terms of snow accumulation. Getty Blizzard hits US east coast - in pictures Blizzard hits North Carolina NCDOT snow plows clear the roadway along Interstate 85 in Greensborough, North Carolina. More than 130,000 people are without power across the South East, with 125,000 of these in the Carolinas. Lance King/Getty Images Blizzard hits US east coast - in pictures Snow covers the White House US Secret Service Agents stand guard outside the White House during a snowstorm in downtown Washington DC MLADEN ANTONOV/AFP/Getty Images

According to FlightAware.com, 3,283 flights within, into or out of the United States have been cancelled today.

More than 130,000 people are without power across the south east.

There are fears the weather system causing the blizzard could head to Britain, albeit in a much milder form.

Although the low pressure system will be extremely modified by the time it reaches British shores, the Met Office has issued 9 yellow "be aware" warnings over Tuesday and Wednesday.

The warnings have been issued across parts of Scotland, Wales and Northern England.

Rain is expected to be persistent and at times heavy, leading to localised river flooding, the Met Office has warned.

Many parts of the warning areas could see between 50 and 100mm of rain, with the most exposed upland parts of north Wales, north-west England and south-West Scotland potentially seeing between 150 and 200mm.

Helen Roberts, a meteorologist at the Met Office said: “The same low pressure weather system will affect weather in the UK and remnants of that storm will travel across the Atlantic, although it will be extremely modified.