The Hezbollah leader, Hassan Nasrallah, did not say how his group would respond to attacks on hand-held devices, which killed dozens when pagers and walkie-talkies exploded.

Hezbollah Secretary-General Seyyed Hassan Nasrallah said Thursday that Israel crossed "all the red lines" by detonating thousands of communication devices used by group members with the intention to kill some 5,

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

Israeli air strikes come after Hezbollah vowed to retaliate over deadly exploding device attacks blamed on Israel.

Post national security reporter Shane Harris breaks down the Israeli attacks on thousands of Hezbollah pagers and radios on Sept. 17 and 18.

Hezbollah and the Israeli military traded new strikes over the border on Thursday. Fears are increasing that 11 months of exchanges of fire between the two sides will escalate into all-out war. Hassan Nasrallah,

Israel launched a series of strikes on Hezbollah targets Thursday as the war against the Lebanon-based group widened in the wake of two consecutive days of deadly explosions triggered in wireless devices.

The source of Wednesday’s explosions was not immediately clear, but the blasts came a day after thousands of pagers used by Hezbollah blew up across Lebanon.

The attack on southern Lebanon on Thursday involved airstrikes and artillery, an Israeli official said, after two days of explosions that killed at least 37 people and injured thousands .