Israeli warplanes regularly violate Lebanese airspace and have struck inside neighbouring Syria from Lebanon on numerous occasions.
A few hours earlier, the Israeli military attacked targets near Syria's capital of Damascus in what it said was a successful effort to thwart an imminent Iranian drone strike on Israel, stepping up an already heightened campaign against Iranian military activity in the region.
The late-night airstrike, which triggered Syrian anti-aircraft fire, appeared to be one of the most intense attacks by Israeli forces in several years of hits on Iranian targets in Syria.
Jonathan Conricus, a military spokesman, said Iran's Revolutionary Guards' Al Quds force, working with allied Shiite militias, had been planning to send a number of explosives-laden attack drones into Israel.
On Twitter, Israeli Prime Minister Benjamin Netanyahu called the attack by Israeli warplanes a "major operational effort."
Syrian state TV said the country's air defenses had responded to "hostile" targets over Damascus and shot down incoming missiles before they reached their targets.In recent days, U.S. officials have said that Israeli strikes have also hit Iranian targets in Iraq.
Hezbollah and Israel fought a monthlong war in 2006. The volatile border between the two countries, which remain technically in a state of war, has been mostly calm since.
- AP