An American drone strike has killed four suspected al Qaeda militants associated with the latest threat that prompted the closing of U.S. embassies across the Middle East and North Africa, according to a senior U.S. official.

“We got the operational guys we were after,” the official said, referring to the four men killed in Yemen.

The strike is among the latest in an aggressive counter-terrorism campaign waged by American drones, which have killed approximately three dozen people in Yemen just over the last two weeks, another U.S. official told ABC News.