Hezbollah’s deadly attack against an army base deep inside Israeli territory presents a major headache for Israel as it continues to struggle to defuse the threat posed by the group.

Sirens wailed Saturday morning in Israel, warning of incoming fire from Lebanon, with a drone launched toward Israeli Prime Minister Benjamin Netanyahu’s house in Caesarea, the Israeli government said.

Hezbollah said the drone attack was in retaliation for two Israeli strikes in Beirut on Thursday that killed 22 people.