FILE - In this Feb. 12, 2014 file photo the Coast Guard Cutter Biscayne Bay, a 140-foot ice-breaking tug, sails through ice covered waters toward the shores off Indiana. U.S. Steel said Monday, April

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FILE - In this Feb. 12, 2014 file photo the Coast Guard Cutter Biscayne Bay, a 140-foot ice-breaking tug, sails through ice covered waters toward the shores off Indiana. U.S. Steel said Monday, April 7, 2014 that its largest mill in Gary, Ind., is on limited production after a shortage of vital iron ore due to the ice covering Lake Superior had temporarily shut down its furnaces. (Coast Guard photo by Chief Petty Officer Alan Haraf, File)

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Associated Press
Tue, Apr 8, 2014 12:29 AM EDT