The deadly arctic deep freeze wreaking havoc across the United States has left at least seven people dead with record-breaking low temperatures halting postal services in the Midwest and cancelling more than 2,500 flights.Two people died in Detroit, Michigan after temperatures started plummeting late Tuesday as forecasters issued grave warnings that one of the coldest spells in history would be life-threatening.Police found a man's body across the street from his home in the Detroit area on Wednesday.He was not wearing a hat or gloves and wasn't dressed for below-zero temperatures.A 70-year-old man was also found dead in Detroit in front of a neighbor's home on Wednesday.The polar vortex in the Midwest came on the heels of major Winter Storm Jayden that dumped up to a foot of snow on the region over the weekend and was to blame for at least five deaths.A 55-year-old man froze to death in his Milwaukee garage after he collapsed shoveling snow, a man was fatally struck by a snow plow in Chicago, a nine-year-old died in an Iowa pile up and a young couple were killed when their SUV struck another on a snowy road in northern Indiana.Officials have warned that the freezing temperatures will only become more life-threatening overnight on Wednesday.Forecasters advised against breathing deeply or talking while outside and warned that frostbite and hypothermia issues could occur within seconds.Temperatures plunged to as low as minus 42F in Park Rapids, Minnesota, minus 31F in Fargo, North Dakota and minus 27F in Minneapolis.In Chicago, temperatures were still dropping after plunging early Wednesday to minus 19F, breaking the day's previous record low set in 1966.Temperatures are expected drop as low as negative 28 degrees in Chicago as the day progresses.Wind chills in northern Illinois made it feel as cold as negative 57F.In comparison, temperatures in parts of the Midwest were lower Wednesday than in Antarctica, where the Amundsen-Scott South Pole Station hit negative 25F.The extreme weather conditions triggered widespread closures of hundreds of schools and businesses from North Dakota to Pennsylvania.Amtrak also axed all trains into and out of Chicago on Wednesday and most services to or from Chicago on Thursday.Crews had to set rail tracks in fire to keeps trains moving smoothly on Tuesday.More than 2,500 flights were canceled early Wednesday, largely out of Chicago O'Hare and Chicago Midway international airports, according to flight tracking site FlightAware.The U.S.Postal Service also took the rare step of suspending mail delivery to parts of Indiana, Michigan, Illinois, Ohio, the Dakotas and Nebraska on Wednesday because of the dangerous Arctic blast.Sub-zero temperatures already blanketing parts of Canada began sweeping across the Midwest and towards the East Coast on Tuesday evening.The frigid winds were bound for the East Coast later on Wednesday into Thursday.The National Weather Service forecast for Wednesday night predicted temperatures in C

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