(NEWSER– Exxon Mobil is mopping up an underground pipeline spill that dumped thousands of gallons of oil on an Arkansas town, reports Reuters, as critics are using the accident to again pounce on the Keystone XL pipeline. A leak detected late Friday in Mayflower forced Exxon to shut its Pegasus pipeline, which was carrying heavy Canadian crude that ended up spilling onto suburban streets.

It's not clear exactly how much oil spilled; the Pegasus pipeline is capable of moving 90,000 barrels per day. At least 22 homes in the area were evacuated, but officials say that they prevented the oil from entering a local lake.

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