FILE - This July 2, 2011 file photo shows oil from a ruptured ExxonMobil pipeline on the Yellowstone River and along its banks near Laurel, Mont. A federal investigation says Exxon Mobil’s delayed ... more 
FILE - This July 2, 2011 file photo shows oil from a ruptured ExxonMobil pipeline on the Yellowstone River and along its banks near Laurel, Mont. A federal investigation says Exxon Mobil’s delayed response to a pipeline break beneath Montana’s Yellowstone River made the spill far worse than it otherwise would have been. (AP Photo/Matthew Brown, File) less 
1 / 25
Associated Press | Photo By Matthew Brown, File
Wed, Jan 2, 2013 3:33 PM EST