Eighteen members of the ISIS terrorist group were killed on Thursday in air strikes on a Syrian region near the Iraqi border, the Syrian Observatory for Human Rights said Friday. A senior Iraqi commander was among the victims in the strikes on the village of Sousa in the eastern province of Deir Ezzor. Most of the victims were foreigners. The Britain-based monitor, which relies on sources inside Syria for its information, was unable to say if the strikes were carried out by a US-led coalition fighting ISIS or Iraq. The Iraqi army said it had targeted an ISIS "operations room" inside Syria late Thursday, killing "a number of ISIS elements", but did not mention a precise location. It was not immediately clear whether the Iraqi army and the Observatory were referring to the same incident. ISIS overran large swathes of Syria and neighboring Iraq in 2014, proclaiming a "caliphate" in land it controlled. But the terror group has since lost most of it to various offensives in both countries. In Syria, its presence has been reduced to pockets in Deir Ezzor and parts of the vast Badia desert.