JERUSALEM, March 22 (Xinhua) -- A man was killed on Sunday when a rocket fired from Lebanon by Hezbollah struck vehicles near the Israeli border, Israeli authorities said.

The rocket hit two vehicles in the Upper Galilee near the Israel-Lebanon border, the Magen David Adom rescue service said in a statement. Police confirmed the death.

The strike came amid a drone attack from Lebanon and at least four missile salvos launched from Iran on Sunday morning, triggering sirens across Israel.

Explosions were heard in Jerusalem and Tel Aviv. The military said one of the Iranian missiles appeared to be a cluster munition, with bomblets or fragments reported by Israel's Fire and Rescue Services in at least three cities.

Military chief Eyal Zamir said the army was investigating why air defense systems failed to intercept the latest projectiles, including a ground-to-ground ballistic missile launched late Saturday from Iran.

The missile struck a residential area in the southern city of Arad, where health authorities said at least 115 people were wounded, including 10 seriously.

The attacks came as the regional conflict, sparked by a U.S.-Israeli strike on Iran, entered its 23rd day. ■