The US military killed a senior ISIS leader in a raid in Syria on Friday, as well as two of his ISIS-affiliated sons, according to a release from US Central Command.

The military gave few details on the ground operation, but counterterrorism raids have typically involved helicopter-borne Special Operations commandos.

“We will continue to relentlessly pursue ISIS terrorists wherever they operate,” Gen. Michael Kurilla, head of U.S. Central Command, said in a statement. “ISIS terrorists are not safe where they sleep, where they operate, and where they hide.