"Israeli Air Force planes carried out airstrikes at an artillery position belonging to the Syrian Army," the source said. "The artillery was used to help the army repel attacks from militants in the eastern part of Zabadani."
The source added that Islamist militants attacked Syrian army positions on the east side of Zabadani in the early hours of Thursday. The Syrian military, supported by the artillery shelling, managed to repel the attack after a three-hour battle.
Some 200 militants, surrounded by the Syrian army and fighters from the Lebanese Hezbollah movement, are entrenched in the center of Zabadani.
Syria has been in a state of civil war since 2011, with government forces fighting anti-government rebels and radical Islamists, including the notorious Islamic State militant group.