Officials stand next to derailed freight train cars in Paulsboro, N.J., Friday, 

Officials stand next to derailed freight train cars in Paulsboro, N.J., Friday, Nov. 30, 2012, after several tanker cars carrying hazardous materials toppled from a bridge and into a creek. At least one tanker car may contain vinyl chloride, Gloucester County Emergency Management director J. Thomas Butts told WPVI-TV. (AP Photo/Mel Evans)
Associated Press
Officials stand next to derailed freight train cars in Paulsboro, N.J., Friday, Nov. 30, 2012, after several tanker cars carrying hazardous materials toppled from a bridge and into a creek. At least one tanker car may contain vinyl chloride, Gloucester County Emergency Management director J. Thomas Butts told WPVI-TV. (AP Photo/Mel Evans)
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