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BP operations on Alaska's North Slope (Image courtesy of BP)

BP work crews started cleaning up contaminated snow on Alaska’s North Slope Thursday after a Prudhoe Bay well line ruptured, spraying a 34-acre area with crude oil and natural gas.

The amount spilled is still being investigated by BP and Alaska’s Department of Environmental Conservation.

After the spill, North Slope production dropped around 10,000 bpd, from 533,000 to 521,000, according to state tracking data. 

Eight years ago BP had to order Prudhoe operations to be partially shut down when a transit line leak discharged about 200,000 gallons of oil.