BEIRUT — Israeli drones dropped four grenades close to U.N. peacekeepers in southern Lebanon near the border with Israel as they were working to clear roadblocks, the force said Wednesday. No one was hurt in the strike.

The peacekeeping force , the U.N. Interim Force in Lebanon, described the Tuesday morning incident as “one of the most serious attacks on UNIFIL personnel and assets” since the cessation of hostilities in November that ended the 14-month Israel-Hezbollah war .

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