BEIRUT (AP) — Two U.S. airstrikes in Syria killed 37 militants affiliated with the Islamic State group and an al-Qaeda-linked group, the U.S. military said Sunday. It said two of the dead were senior militants.

U.S. Central Command said it struck northwestern Syria on Tuesday, targeting a senior militant from the al-Qaeda-linked Hurras al-Deen group and eight others. They say he was responsible for overseeing military operations.

On Sept. 16, a “large-scale airstrike” on an IS training camp in an undisclosed location in central Syria killed 28 militants, including “at least four Syrian leaders,” Central Command said.

“The airstrike will disrupt ISIS’ capability to conduct operations against U.S. interests, as well as our allies and partners,” the statement read.

There are some 900 U.S. forces in Syria, along with an undisclosed number of contractors, mostly trying to prevent any comeback by the extremist IS group, which swept through Iraq and Syria in 2014, taking control of large swaths of territory.

U.S. forces advise and assist their key allies in northeastern Syria, the Kurdish-led Syrian Democratic Forces, located not far from strategic areas where Iran-backed militant groups are present, including a key border crossing with Iraq.