Hezbollah was reeling Saturday from an Israeli airstrike that killed two of its senior figures and dozens of other people, intensifying fears of all-out war in the Middle East in the wake of the deadly attacks on the group’s communication devices.

The militant group said 16 of its members were killed in Friday’s attack in Beirut, which Lebanon’s health minister said left a total of 31 people dead.

Israel has launched a rare airstrike that killed a senior Hezbollah military official in a densely populated southern Beirut neighborhood.