People walk along a seaside promenade during heavy snowfall in Thessaloniki on January 10, 2017.
Officials suspended shipping along Europe's second-longest waterway on Tuesday as a polar spell gripped a large swathe of the continent, causing hardship especially among migrants, the homeless and the elderly. The deep freeze has caused at least 61 deaths since it began last week, a third of those in Poland.
Romanian police halted shipping at midday for an undetermined period along a 900-kilometer (565-mile) stretch of the Danube River, which crosses Romania. Croatian and Serbian authorities also stopped river traffic on the Danube.
In Serbia, shipping was banned on the River Sava because of icy conditions, which claimed another two lives in southern Serbia.
Authorities said an 88-year-old man and his son, 64, died from freezing temperatures in the village of Duga Poljana, in the south, which has been hardest-hit by the recent cold spell. Serbian state TV reported the two victims, discovered by a man delivering bread from a neighboring village, were extremely poor.
Three people have been found dead in the past three days in Macedonia as temperatures plunged to -20 C (-4 F). One 68-year old homeless man was found frozen to death in the capital, Skopje, while a 60-year-old man died in front of his home in the southern town in Strumica. An 80-year-old woman was discovered in her home in eastern Macedonia.
Authorities urged homeless people to go to shelters and local schools, which are taking them in during the cold spell.
In Albania, it snowed in the southern city of Saranda for the first time in 32 years. A homeless Albanian man was found dead in the southeastern city of Korca, the fifth person to die in the frigid weather.
In central town of Bulqize, temperatures plummeted to -22 C (-7.6 F), with most rural areas cut off by snow. There were temporary power and water outages. Army helicopters were distributing aid in remote mountain areas.
Following strong criticism from aid agencies and others, authorities on the Greek island of Lesbos said they would move 250 refugees from tents at camps into vacant hotel rooms as the heavy snow continued unabated around the country.
"We denounce the inhuman living conditions refugees on Lesbos are facing," the island's public hospital doctors association said "They are living in mud and snow, cramped together in unsuitable tents ... and lighting fires inside them to stay warm."
Elsewhere, snow grounded flights in the country's second-largest city, Thessaloniki, while a state of emergency was declared in several parts of Greece.
Snow dusted the ancient Acropolis in Athens and closed most schools in the capital, while more than 10 heated shelters were opened for the homeless. An Athens municipal employee was placed under disciplinary review after he closed a shelter, telling occupants to leave because his shift had ended.
One person died and more than 10 were injured in Istanbul after a mosque canopy collapsed because of high winds and snowfall. It happened during a funeral service near Istanbul's main airport.
Bulent Kerimoglu, a district mayor, told reporters ambulances rushed the injured to nearby hospitals.
Several Serbian municipalities have declared emergency measures to battle the extreme weather and dozens of villages in the south have been cut off by high snowdrifts.
In Romania, Bucharest Mayor Gabriela Firea on Tuesday ordered schools in the capital to remain closed for the rest of the week as the country battled the bitter cold which has led to travel delays, power outages and a surge in demand for natural gas and power.
Farther north in Poland where 20 people have died since the cold spell started last week, alarming smog levels led authorities to close schools and kindergartens for two days in the southern city of Rybnik to protect children from noxious fumes, and offer free public transport to try and improve air quality.
Poland's capital, Warsaw, offered free public transport on Monday, and the situation improved, although residents complained of coughing and irritated noses and eyes. Smog alarm levels were exceeded in Rybnik, Czestochowa, Katowice and another low-lying industrial region.
The smog mainly emanates from substandard fuels, such as coal mud, waste and plastic, burned in poor quality heaters in private homes, air monitoring expert Barbara Toczko told The Associated Press. She said authorities should help residents acquire heaters which use clean fuel and have low-level emissions.
She said that traffic fumes and industrial smoke also contribute to the air quality, but to a lesser extent as they have to meet European standards.
Poland's Government Center for Security said six people died Monday because of the cold.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)