Hezbollah has pounded northern Israel with 140 rockets, a day after the militant group’s leader vowed to retaliate against Israel for a mass bombing attack, the Israeli military and the militant group said.

Iran's U.N. envoy warned the country had the "right to take all necessary measures to respond to this egregious violation."

Daily exchanges of fire between Hezbollah and Israel have been destructive, disruptive and sometimes deadly. An escalation could risk starting a wider regional conflict.