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.

An Israeli airstrike in Beirut killed at least nine people and wounded nearly 60 others, Lebanese health officials said. It was the first such Israeli attack on Lebanon’s capital in months and came shortly after Hezbollah pounded northern Israel with 140 rockets.

Iran-aligned group Hezbollah accused its arch-foe Israel of detonating pagers across Lebanon on Tuesday, a sophisticated operation that followed a series of assassinations of Israel's enemies since the Gaza war erupted on Oct.