United States Special Forces killed ISIS senior leader Abu Sayyaf and captured his wife, Umm, in Syria after the terrorist org’s oil and gasoline mastermind “engaged” the Army’s Delta Force soldiers during a raid which originally called for the capture of both individuals — according to the Pentagon.

Numerous sources, including Secretary Ashton B. Carter, peg Sayyaf (a Tunisian citizen) as the brains behind ISIS’s black market oil and gasoline operation. While not as lucrative as it once was (the airstrikes that began this past fall have in a likelihood contributed to this decline), Bloomberg Business reported that in June of 2014 the business (or scheme) was raking in $2 million per day refining and smuggling the black gold.

No American was killed or injured during the raid. Which was just the second of its kind aimed toward ISIS militants in Syria.

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Carter said that Umm Sayyaf—who was captured and has been moved to a military detention facility in Iraq—was also suspected of being involved in the militant group’s “terrorist activities, and may have been complicit in what appears to have been the enslavement of a young Yazidi woman rescued last night.”

Bernadette Meehan, the National Security Council spokeswoman, confirmed the rescue. “The operation also led to the freeing of a young Yazidi woman who appears to have been held as slave by the couple,” she said. “We intend to reunite her with her family as soon as feasible.”