As if there wasn't enough oil pouring into the Gulf of Mexico, satellite images have revealed a 10-mile-long slick from another drilling rig, which apparently began leaking days after the Deepwater Horizon disaster began.

Citing an environmental group and federal documents, the Mobile, Ala., Press- Register reports that the smaller leak, from the Ocean Saratoga platform, apparently began around April 30 and was noted by federal officials May 15. But they and Diamond Offshore officials aren't saying anything else about it.

The spill was first reported by SkyTruth, which said it accidentally discovered the separate slick while scrutinizing Deepwater Horizon images. Photos taken during overflights "appear to show a large oil crew boat pumping dispersants into the water at the spill site," the Press- Register writes.

Officials at the National Response Center, which is coordinating the massive BP spill, said the Ocean Saratoga leak had been reported, but they would not say exactly when it began. The Coast Guard has not yet responded either.

The Ocean Saratoga, currently under contract to the Marshall Islands, can operate in water 2,200 feet deep and drill to 25,000 feet.

(Posted by Michael Winter)