Deep freeze grips U.S.

Associated Press
The breath of a bicyclist turns to steam and his beard frosts over as he bikes down the Nicollet Mall Tuesday, Jan. 22, 2013 in downtown Minneapolis where temperatures were in the double-digit, sub-zero numbers. (AP Photo/Jim Mone)

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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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