Cleanup crews work to clear oil from along side the Yellowstone River in Laurel, Mont., Tuesday July 5, 2011. The Yellowstone River swelled above flood levels Tuesday, raising fears that the surge will push thousands of gallons of oil spilled from a broken pipeline into undamaged areas and prolong cleanup efforts as crude seeps downstream and into back channels. (AP Photo/Jim Urquhart)

Associated Press
Cleanup crews work to clear oil from along side the Yellowstone River in Laurel, Mont., Tuesday July 5, 2011.   The Yellowstone River swelled above flood levels Tuesday, raising fears that the surge will push thousands of gallons of oil spilled from a broken pipeline into undamaged areas and prolong cleanup efforts as crude seeps downstream and into back channels.  (AP Photo/Jim Urquhart)
Cleanup crews work to clear oil from along side the Yellowstone River in Laurel, Mont., Tuesday July 5, 2011. The Yellowstone River swelled above flood levels Tuesday, raising fears that the surge will push thousands of gallons of oil spilled from a broken pipeline into undamaged areas and prolong cleanup efforts as crude seeps downstream and into back channels. (AP Photo/Jim Urquhart)
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