Six pro-Iranian fighters were killed late Saturday during alleged Israeli air strikes targeting positions belonging to regime forces and Tehran-backed militias in eastern Syria, a war monitor said.
Four Syrian nationals were among those killed in the raids on the al-Abbas village near the border with Iraq, said the Britain-based Syrian Observatory for Human Rights.
It was not immediately clear if they were soldiers with the Syrian army.
The war monitor did not confirm who was behind the attack but said Israel was "likely responsible."
Last Tuesday, the Syrian army said that two soldiers and four civilians were killed in airstrikes it attributed to Israel.
State-run Syrian television said the country's air defenses had responded to the airstrikes, while state-controlled Sana News Agency said the air defense systems were operating against "hostile targets."
The TV said the strikes were in airspace in the southeastern part of the country, near the city of Sweida, and in the eastern province of Deir al-Zor bordering Iraq.
Israel has launched hundreds of strikes in Syria since the start of the civil war in 2011.
It has targeted government troops, allied Iranian forces and fighters from the Lebanese Shi'ite militant group Hezbollah.
It rarely confirms details of its operations in Syria, but says Iran's presence in support of Syrian President Bashar al-Assad is a threat and that it will continue its strikes.