London, UK (BBN)-Emergency teams are working to evacuate people from homes in York, as flooding continues to hit northern England.
Police advised between 300 and 400 people to evacuate near the River Ouse and River Foss in York, with up to 3,500 properties at risk, reports BBC.
Hundreds of flood alerts and warnings are in place for England, Wales and Scotland, including more than 20 severe warnings - indicating danger to life.
Environment minister Liz Truss said the government will review flood defences.
Truss said there had been "unprecedented" levels of rainfall in parts of northern England, saying it was "right to say" flood defences had been "overwhelmed".
She warned some rivers had not yet reached their expected high peak, saying the Army had been deployed in York, Leeds, and parts of Lancashire.
Prime Minister David Cameron is due to chair an emergency conference call and will visit some of the flood-affected areas on Monday.
More than 7,500 customers in Greater Manchester and Lancashire remain without power, Electricity North West said, including 5,500 homes and businesses in Rochdale.
Officials said pumps at the Foss Barrier - where the River Foss joins the River Ouse - had been overwhelmed and flood barriers had to be lifted, meaning areas in York that would usually be protected were now vulnerable to flooding.
York City Council said the River Ouse was expected to peak at more than 5m - close to to its highest recorded level of 5.40m.
The Environment Agency said the River Ouse's water level had reached 4.65m at 04:00 GMT on Sunday. Its typical level is between 0.5m and 1.9m.
IN OTHER DEVELOPMENTS:
The Scottish Environment Protection Agency has issued a number of warnings and alerts
"Urgent action" is required to prevent further flooding on the A55 in north Wales, Plaid Cymru say
Red Cross volunteers are using 4x4s to transport doctors and nurses to Bangor Hospital due to flooding on the A55
The River Aire in Leeds reached "record levels" at 23:00 GMT on Saturday, the Environment Agency said
Electricity North West warned power may not be restored to some 7,000 homes until Monday
Residents of the Windsor House residential home, in York, were moved to other care homes after the basement flooded
North Yorkshire Police said they had run out of "road closed" signs
More than 50 people, mostly elderly residents, spent the night in a British Red Cross shelter in Bury
Northern Rail is advising passengers not to travel in Cumbria, East Lancashire and West Yorkshire on Sunday journey
Resident Brian Marshall said flood waters in Hebden Bridge, West Yorkshire, had been running with such force on Saturday night that sandbags had been "ripped up".
He said: "It was just impossible to do anything."
Lt Col Hamish Cormack, from the Duke of Lancaster Regiment, said levels in York were still rising - saying "we've not probably seen the worst of it yet".
Meanwhile, Nigel Evans, the Conservative MP for Ribble Valley, called on the government to release funds immediately to help those affected.
On Saturday, Lancashire bore the brunt of the flooding, along with parts of Yorkshire.
People in 3,500 York properties near the River Foss, a tributary of the Ouse, were advised to move belongings upstairs and to be ready to leave.
Areas of Greater Manchester, including Salford, Bolton, Bury, Rochdale and Wigan, were also badly affected by flooding, with more than 300 flood-related calls to the fire service in 24 hours.
BBC Weather forecaster Alex Deakin said while there would be more rain in the north of England during Sunday, it would not be as intense or prolonged as the downpours on Saturday.
Meanwhile, the Met Office issued a yellow warning for ice in parts of Scotland, but no further weather warnings were in place on Sunday morning.
People can access information from council websites and the Environment Agency Floodline.
The agency is also operating a phone line - 0345 988 1188 - which will be staffed rather than offering recorded information.
BBN/SK/AD