This photo taken from a position in northern Israel shows an Israeli Air Force fighter jet firing flares as it flies to intercept a hostile aircraft that launched from Lebanon over the border area with south Lebanon on August 25, 2024. AFP
"The number of Katyusha rockets launched until now is more than 320... towards enemy positions," a Hezbollah statement said, adding it had targeted 11 Israeli bases and barracks, including on the annexed Golan Heights.
It had earlier also said it "began an air attack with a large number of drones" targeting deep into Israel.
The Iran-backed movement has exchanged regular fire with Israel since the beginning of the war on Gaza.
But fears of full-blown conflict grew after Iran and Hezbollah vowed revenge for the killing last month, blamed on Israel, of Hamas leader Ismail Haniyeh in Tehran, and an Israeli strike that killed Fuad Shukr, a top Hezbollah commander, in south Beirut.
The Lebanese movement said its attack came in an "initial response" to Shukr's killing.
The "first phase has ended with total success", the group said, adding that this phase sought to "target Israeli barracks and positions to facilitate the passage of attack drones towards targets" deep inside Israel.
There was no immediate confirmation from the Israeli military.
Hezbollah also said it was "in a high state of readiness", adding that "if civilians are harmed, there will be very severe punishment".
Lebanon's official National News Agency reported Israeli strikes on a large number of locations in south Lebanon.
Beirut's international airport was working normally.
The cross-border violence since October has killed more than 600 people in Lebanon, mostly Hezbollah fighters but including at least 131 civilians, according to an AFP tally.
On the Israeli side, authorities have announced the deaths of at least 23 soldiers and 26 civilians, including in the annexed Golan Heights.
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