Description of . Authorities search a section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups.  (AP Photo/The Detroit News, David Coates)
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