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A Good Samaritan paid for 70 homeless people to stay in hotel rooms in Chicago as temperatures plunged to near-record lows of -30C.
The mystery donor stepped in after dozens of rough sleepers were forced to abandon a makeshift encampment in the frozen Illinois city.
Authorities closed off the “tent city” after one of the gas tanks that had been heating the area, numbering between 150 and 200 in total, exploded on Wednesday.
Many of the propane bottles had been donated by members of the public to help the homeless people keep warm as an Arctic blast keeps the US Midwest in a deadly deep freeze .
No one was hurt in the blast, but fire chiefs warned the use of the gas tanks was “extremely unsafe”.
Polar vortex brings temperatures colder than Antarctica to the USShow all 52 1 /52Polar vortex brings temperatures colder than Antarctica to the US Polar vortex brings temperatures colder than Antarctica to the US Chicago Ice covers the Lake Michigan shoreline
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Polar vortex brings temperatures colder than Antarctica to the US Minnesota A firefighter walks past an ice-encrusted home after an early morning house fire
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Polar vortex brings temperatures colder than Antarctica to the US Ontario People walk in a park on the US side of Niagara Falls
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Polar vortex brings temperatures colder than Antarctica to the US Massachusetts Mike Calen, left, and Steve Goyette, right, prepare to tie off as the ice covered fishing boat, Buzzards Bay, arrives at New Bedford harbour
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Polar vortex brings temperatures colder than Antarctica to the US Pedestrians protecting their faces from the cold in New York City, in Washington DC, along Lake Michigan's ice covered shoreline, in the Brooklyn borough of New York, in Chicago, in Kingston, Ontario, and in Montreal
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Polar vortex brings temperatures colder than Antarctica to the US Chicago Snow and ice covers Soldier Field
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Polar vortex brings temperatures colder than Antarctica to the US Chicago Gas-burning heaters are placed on railroad tracks as Metra commuter train passes by
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Polar vortex brings temperatures colder than Antarctica to the US Chicago Ice builds up along the shore of Lake Michigan
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Polar vortex brings temperatures colder than Antarctica to the US Ontario A tree is covered in ice from the mist at park beside the falls in Niagara Falls
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Polar vortex brings temperatures colder than Antarctica to the US Minneapolis Water vapor rises above St. Anthony Falls on the Mississippi River beneath the Stone Arch Bridge
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Polar vortex brings temperatures colder than Antarctica to the US Massachusetts Ice flows fill the Merrimack River as it heads towards the Atlantic Ocean in Newburyport
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Polar vortex brings temperatures colder than Antarctica to the US Ontario A tourists take pictures of the Canadian Horseshoe falls in Niagara Falls
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Polar vortex brings temperatures colder than Antarctica to the US Minneapolis Sub-zero temperatures produce icicles that hang from a restaurant
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Polar vortex brings temperatures colder than Antarctica to the US Ontario A person takes a selfie beside on the US side of Niagara Falls
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Polar vortex brings temperatures colder than Antarctica to the US
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Polar vortex brings temperatures colder than Antarctica to the US Minneapolis Water vapor from the Mississippi River envelopes a bridge as sub-zero temperatures produce dangerous windchills
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Polar vortex brings temperatures colder than Antarctica to the US New York Pedestrians walk through the falling snow in the Financial District
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Polar vortex brings temperatures colder than Antarctica to the US Ontario Steam rises from the US Niagara Falls before sunrise
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Polar vortex brings temperatures colder than Antarctica to the US Chicago Snow covers Wrigley Field entrance
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Polar vortex brings temperatures colder than Antarctica to the US New York Workers shovel at the entrance to City Hall in whiteout conditions
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Polar vortex brings temperatures colder than Antarctica to the US NASA's 'Blue Marble' data set of weather systems over the continental United States
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Polar vortex brings temperatures colder than Antarctica to the US Chicago Ice and snow builds up along Lake Michigan
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Polar vortex brings temperatures colder than Antarctica to the US Minneapolis
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Polar vortex brings temperatures colder than Antarctica to the US Minneapolis Chuck Carpenter is frost covered as he goes for a walk
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Polar vortex brings temperatures colder than Antarctica to the US Chicago A man walks along the lakefront as temperatures hovered around -20 degrees
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Polar vortex brings temperatures colder than Antarctica to the US Chicago Frozen Chicago River
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Polar vortex brings temperatures colder than Antarctica to the US New York A man walks next to a subway train as heavy snow falls
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Polar vortex brings temperatures colder than Antarctica to the US Chicago A digital board shows flight cancellations at Terminal 3 at O'Hare International Airport
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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Polar vortex brings temperatures colder than Antarctica to the US Chicago A shirt that was hung is seen frozen
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Polar vortex brings temperatures colder than Antarctica to the US Chicago People walk along the lakefront
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Polar vortex brings temperatures colder than Antarctica to the US New York A young man waits on a subway platform in freezing temperatures
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Polar vortex brings temperatures colder than Antarctica to the US Chicago Mist rises from the city and Lake Michigan
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Polar vortex brings temperatures colder than Antarctica to the US New York People walk through the snow in lower Manhattan
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Polar vortex brings temperatures colder than Antarctica to the US Chicago The James Versluis breaks ice on the frozen Chicago River near Navy Pier
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Polar vortex brings temperatures colder than Antarctica to the US Michigan
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Polar vortex brings temperatures colder than Antarctica to the US Minneapolis
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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Polar vortex brings temperatures colder than Antarctica to the US New York
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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Polar vortex brings temperatures colder than Antarctica to the US Michigan
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Polar vortex brings temperatures colder than Antarctica to the US New York
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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Polar vortex brings temperatures colder than Antarctica to the US New York
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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Polar vortex brings temperatures colder than Antarctica to the US Minneapolis
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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Polar vortex brings temperatures colder than Antarctica to the US Chicago
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The homeless people who had been sleeping in the camp were set to be sheltered by the Salvation Army, until the charity learned the Good Samaritan had offered to put them up in a hotel in Chicago’s south side.
"We think it’s wonderful that there’s somebody out there that has decided to be so kind to provide a warm place and a safe place for these folks to go," the charity's spokeswoman Jacqueline Rachev told the Washington Post . "We’re thrilled they’re safe and warm, at least for a few days."
The identity of the donor is not known, but they are thought likely to have picked up a bill of thousands of dollars.
Their act of generosity came amid heavy snow and plummeting temperatures in Chicago, which recorded its second-coldest day in history this week.
At least 21 people, nine of them in Chicago, have died as Arctic conditions paralyse the Midwest. Doctors in Chicago said they had seen dozens of frostbite victims, some of whom were likely to require amputation.
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