Temperatures plunged to new lows in Europe where a week-long cold snap has now claimed more than 220 lives and forecasters warned Friday that the big freeze would tighten its grip at the weekend.

People have been found dead on the streets in some countries, while thousands have been trapped in mountain villages in Serbia. Even Rome was dusted in snow, and Venice's canals started freezing over.

In the last seven days, a total of 222 people have died from the cold weather, according to an AFP tally, with Ukraine suffering the heaviest toll.

The lowest temperatures recorded were in the southwest of the Czech Republic, where the mercury dropped as low as minus 38.1 degrees Celsius (minus 36.5 Fahrenheit) overnight.

The EU executive said vital Russian gas deliveries had fallen in nine countries, with the Russian giant Gazprom invoking flexibility clauses as it also braves a cold snap. Supplies fell 30 percent in Austria and 24 percent in Italy.

Ukraine's emergencies ministry raised the death toll substantially to 101, of whom 64 died on the streets, from 63 previously.

Almost 1,600 people have requested medical attention for frostbite and hypothermia and thousands have flocked to temporary shelters.

The ferocious temperatures killed eight more people over the last 24 hours in Poland, bringing the death toll to 37 since the deep freeze began a week ago, police said.

Temperatures plunged to minus 35 Celsius in some areas of Poland, while in Bulgaria parts of the River Danube have frozen over.

Elsewhere in Bulgaria, another six people were found dead from the cold, bringing the overall tally to 16 in the last week, according to local media.

Most of the dead in the European Union's poorest country were villagers found frozen to death on the side of the road or in their unheated homes, the reports said.

More than 1,000 Bulgarian schools remained closed for a third day amid fresh snowfalls and piercing winds in the northeast.

In neighbouring Romania two more people died, bringing the overall toll to 24, and hundreds of school remained closed.

In Rome, residents experienced only their second day of snow in 15 years, with white flakes covering palm trees, ancient Roman ruins and Baroque churches across the capital.

Up to five centimetres (two inches) of snow fell in some districts and ancient monuments like the Colosseum were closed to visitors for fear of damage to the structure.

Temperatures in the Alpine region of Piedmont in northern Italy went as low as minus 30 degrees Celsius and drivers were advised to avoid regions in the centre of the country due to heavy snowfall and resulting traffic problems.

Canals in Venice, where temperatures fell as low as minus 5 Celsius, started freezing. However trains resumed normal service across the country except in and around Bologna and on a local line near Rome after days of delays.

Three people have died due to the extreme weather in recent days, including a homeless man found in Milan on Thursday.

Estonia and France announced their first casualties of the freeze, with a man found frozen to death on a street in Tallin and an 82-year-old man suffering from Alzheimer's dying of hypothermia in the eastern French village of Lemberg after wandering out of his home in pyjamas.

Rescuers in Serbia ploughed through snowdrifts to get food, supplies and aid to residents of mountain villages, where thousands of people have been trapped.

"To help a woman who needed to reach a hospital we were breaking through two-metre (six-foot) snow drifts, which lasted for two and a half hours," said Vedran Taskovic, a rescuer in the southeastern town of Vranje.

"Eventually, we had to make a sleigh of nylon bags to get her to the road, as she couldn't walk."

Swathes of Britain were bracing for snow after temperatures plunged to minus 11 degrees Celsius overnight in some areas, with authorities warning that the cold could catch people off-guard after a warmer-than-normal winter so far.

The first snow hit Belgium on Friday causing more than 1,100 kilometres (690 miles) of traffic jams on roads and highways, according to automobile associations. The last record was 948 kilometres registered in February 2010.

The French, who have cranked up their heating systems were on Monday expected to break an all time power consumption record set in 2010, with consumers being asked in some regions to turn off appliances for at least four hours a day to avoid blackouts.

The cold snap has also killed people in the Baltic countries of Latvia and Lithuania, as well as Austria and Greece.

burs-ach/txw