Deep freeze grips U.S.

Associated Press
Ice crystals form frost on the window of a home in Medina, Minn., as the area experiences subzero temperatures on Monday, Jan. 21, 2013. (AP Photo/The Star Tribune, Richard Sennott)

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A cold snap has sent as waves of Arctic air swept south from Canada, pushing temperatures to dangerous lows and leaving parts of the Midwest and Northeast reeling.

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