A series of U.S. airstrikes targeted several camps run by the Islamic State group in Syria in an operation the U.S. military said will disrupt the extremists from conducting attacks in the region and beyond.

The U.S. Central Command said the airstrikes were conducted Friday, without specifying in which parts of Syria. About 900 U.S. troops have been deployed in eastern Syria alongside the U.S.-backed and Kurdish-led Syrian Democratic Forces that were instrumental in the fight against IS militants.

Despite their defeat, attacks by IS sleeper cells in Iraq and Syria have been on the rise over the past years, with scores of people killed or wounded.