Hezbollah has targeted Israeli soldiers near the Lebanese border village of Labbouneh with artillery shells and rockets, the group said, a day after Israel said it had killed two successors to Hezbollah’s slain leader Hassan Nasrallah.

According to Reuters, sirens sounded in northern Israel today, the Israeli military said, adding three Israeli military personnel were severely injured on Tuesday and Wednesday during combat in southern Lebanon.

Hashem Safieddine, the man expected to succeed Nasrallah, has not been heard from publicly since that airstrike, part of an escalating Israeli offensive after a year of border clashes with Hezbollah.

Israel’s military said on Tuesday that heavy air strikes against underground Hezbollah installations in southern Lebanon over the prior 24 hours killed at least 50 fighters including six sector commanders and regional officials.