The U.S. Air Force recently zapped an Islamic State drone with an electronic weapon, the service’s top civilian said.

Air Force Secretary Deborah Lee James on Monday said the service targeted a small, weaponized drone operated by militants “a week or two ago” because it was responsible for killing four non-U.S. citizens in the Middle East.

“The Air Force over there in theater was informed there was one such unmanned aerial system in the vicinity and fairly quickly we were able to bring it down, we brought it down through electronic measures,” James said at an event hosted by the Center for a New American Security in Washington, D.C.

“It’s an example of something we have to attack quickly,” said James, who didn’t specify which system was used to immobilize the prop aircraft.

The comments by the secretary, who spoke alongside Army Secretary Eric Fanning and Navy Secretary Ray Mabus, highlight the military’s desire to address the growing challenge of targeting small but potentially lethal drones.

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