Five commanders of Iranian-backed militias in Syria were killed in an airstrike on Tuesday, according to Saudi television station al-Hadath, cited by Israeli media that night.
A further report claimed that one of those killed was a Hezbollah commander.
The Syrian Observatory for Human Rights, a UK-based monitor, had reported three explosions and the presence of unidentified aircraft that day in the eastern city of Dier-ez-Zor.
This is a developing story.