Cold weather has caused 12 deaths in the eastern European country of Poland since the beginning of 2017.
Police said multiple deaths were caused in traffic accidents as heavy snowfall and below-freezing temperatures sweep the country and freeze roads.
"A total of 21 traffic accidents have occurred during the past 24 hours, leaving four dead and 27 injured," said Dawid Marciniak, an official of Poland's General Police Headquarters.
Marciniak said, the homeless are extremely vulnerable to the cold snap, with some found dead while lying on the ground. He said the authorities are providing extra homeless services to avoid people's exposure to the extreme cold weather.
"We are now patrolling in the areas where the homeless frequents and take rest. We would communicate with them and provide emergency rescue if necessary. We would also send the homeless to reception center," said Marciniak.
A sharp cold front swept a large part of Poland this week, bringing the temperature down to minus 21 degrees Celsius in the capital city on Saturday.
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