The Israeli military said it struck 300 targets Monday in Lebanon in one of the most intense barrages of airstrikes in nearly a year of fighting against the Hezbollah militant group.
The Lebanese Health Ministry said 100 people were killed and more than 400 wounded in what would be the deadliest day in Lebanon since the conflict started in October.
Before the escalation beginning with the wave of pager explosions last Tuesday, around 600 people had been killed in Lebanon since October, mostly fighters, but also more than 100 civilians.
The Israeli army announced the action on social media, posting a photo of what is said was the military chief, Lt Gen Herzi Halevi, approving additional attacks from military headquarters in Tel Aviv. Halevi and other Israeli leaders have promised tougher action against Hezbollah in the coming days.
Hezbollah said in a statement that it fired dozens of rockets at an Israeli military post in Galilee. It also targeted for a second day the facilities of the Rafael defence firm, headquartered in Haifa. As Israel carried out the attacks, Israeli authorities reported a series of air-raid sirens in northern Israel warning of incoming rocket fire from Lebanon.