At least 12 members of a pro-Iranian militia in Syria were killed overnight after an unidentified aircraft targeted Iranian bases in the eastern Syrian city Deir ez-Zur, Syrian Human Right Survey Center reported.
Vehicles and ammunition were reportedly destroyed during the operation.
There was no immediate claim of responsibility, but several reports accused Israel of carrying out attacks against Iranian forces and their proxies in Syria.
Syrian Human Right Survey Center claimed that the 12 people killed were Iraqi and Afghan militants of the organization who were residing in the base, which is located close to the Iraqi border.
In the past few years, airstrikes attributed to Israel have targeted dozens of sites belonging to Iran and Iranian-backed forces in Syria.