A second Us bombing at a post near the town of Mayadeen killed another two fighters, according to the Observatory, whose reporting relies on local Syrian contacts.
According to a defense official, the US counter strikes were conducted by F-15 fighter jets flying out of al-Udeid Air Base in Qatar.
The official spoke on condition of anonymity to discuss military operations.
Iran’s paramilitary Revolutionary Guard, which answers only to Supreme Leader Ayatollah Ali Khamenei, has been suspected of carrying out attacks with bomb-carrying drones across the wider Middle East.
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