“This is a matter of serious concern and UNIFIL technical investigations continue,” the peacekeeping force said in a statement.

UNIFIL said two tunnels cross the Blue Line, which demarcates the border between Israel and Lebanon. It called on Lebanese authorities to take “urgent follow-up” actions.

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Israel and Lebanon are technically at war, and Israel and Hezbollah fought a month-long war that ended in stalemate in 2006. The cease-fire called on Israel to withdraw from the south and Hezbollah to keep away from the border. It also stipulated that only UNIFIL and the Lebanese armed forces would be deployed south of the Litani River.

Israel has called on the international community to impose new sanctions on the Iranian-backed Hezbollah, which has tens of thousands of rockets that can reach nearly every part of Israel.

Lebanese President Michel Aoun said this month that his government was ready to take necessary action after a full report from the peacekeeping force on the tunnels.

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In Beirut, Prime Minister-designate Saad Hariri said Lebanon is committed to the full implementation of the cease-fire agreement and respect of the Blue Line. During a meeting with Maj. Gen. Stefano Del Col, the head of UNIFIL, Hariri said the Lebanese army will conduct patrols to deal “with any flaw in the implementation” of the cease-fire.

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Earlier Monday, Lebanese soldiers went on alert after Israeli troops rolled out barbed wire along the border.

Lebanon’s state-run National News Agency said the incident occurred on the edge of the southern village of Mays al-Jabal when Israeli troops installed 200 yards of wire. Lebanese troops protested that the wire was placed on their side of the border.

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The Israeli military said its troops were placing concertina wire “adjacent to the Blue Line” when the standoff occurred. It said the wire was installed entirely in Israeli territory, in coordination with the peacekeepers. “No violent incidents were reported,” it said.