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BP PLC and other oil producers were forced to shut down nearly all their output on Alaska's North Slope, after a leak led to the closure of the Trans Alaska Pipeline.

Analysts said the shutdown of the 800-mile pipeline network could trigger a jump in oil prices unless the leak is repaired quickly, as the region represents a significant slice of domestic U.S. oil output. Some analysts said the disruption could help drive crude-oil prices toward $100 a barrel from below $90 now.

Alyeska Pipeline Service Co., which operates the pipeline network, said the spill had had no apparent impact on the environment or wildlife.