Hezbollah said Saturday it struck a military target in northern Israel, as the fragile ceasefire between Lebanon and Israel has not stopped fighting in the war that began on March 2.

Israel's military said Saturday that one of its soldiers died in combat in southern Lebanon, bringing its losses to 21 personnel since the war with Hezbollah began in early March.

Lebanon and Israel on Friday extended a ceasefire for 45 days, despite a new flareup in violence, the U.S. State Department said after mediating talks.

"The April 16 cessation of hostilities will be extended by 45 days to enable further progress," State Department spokesman Tommy Pigott said.

Lebanon's negotiating delegation in Washington said on Friday that the extension of the truce with Israel and the establishment of a U.S.-facilitated security track pave the way for "lasting stability".

The truce in the Israel-Hezbollah war was extended for 45 days following the third round of negotiations between Lebanese and Israeli representatives in Washington.

The United Nations humanitarian coordinator for Lebanon said on Friday that talks between Lebanon and Israel offer a "critical opportunity" to end the Israel-Hezbollah war.

"Diplomatic efforts now offer a critical opportunity to stop the violence," Imran Riza said in a statement, adding that he hoped "ongoing negotiations will pave the way toward a political solution".

An Israeli strike hit a building in the southern Lebanese city of Tyre on Friday after an evacuation warning, state media reported, despite an extension in the truce between Israel and Hezbollah.

Israel's military had called on residents of several buildings in Tyre to immediately evacuate ahead of planned strikes in the area.

Prime Minister Nawaf Salam on Friday said his country had enough "reckless" wars for foreign interests, calling for Arab and international support in Beirut's negotiations with Israel.

Speaking at an NGO dinner, Salam said that he hoped to "mobilize all Arab and international support to bolster our position in the negotiations" with Israel, shortly after the last round of talks ended and extended the ongoing truce for 45 days.

Speaker Nabih Berri has told President Joseph Aoun in a phone call that Hezbollah would fully commit to a ceasefire if the Lebanese delegation managed to clench a ceasefire commitment from the Israeli side, MTV reported on Friday afternoon, shortly before the start of the second day of Lebanese-Israeli talks in Washington.

If the U.S. war against Iran is renewed, it would have "immediate implications" for the war picture in Lebanon, Israeli newspaper Yedioth Ahronoth reported.

Druze leader Walid Jumblat has said that he does not fear a new civil war in Lebanon because such a war "requires two armed sides, and currently only Hezbollah possesses weapons."