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.

Visiting White House envoy Amos Hochstein met with Netanyahu and other top officials Monday to try to soothe tensions and avoid the opening of a new front between Israel and Lebanon. Netanyahu told the envoy that Israel will do “whatever is necessary” to bring home the residents.

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