A day later, a similar attack struck walkie-talkies. In total, the explosions killed at least 37 people and injured more than 3,000, many of them civilians. Israel is widely believed to be behind the blasts, although it has neither confirmed nor denied responsibility.

Hassan Nasrallah refused to say when or how Hezbollah would take revenge. As he spoke, Israeli fighter jets swooped low over Beirut.

The attack came hours after Hezbollah fired 140 rockets at northern Israel and follows this week's deadly explosions of pagers and walkie-talkies carried by Hezbollah members.