Projectiles fired from Lebanon triggered air raid sirens in northern Israel, the Israeli military said on Monday, adding it had intercepted one of them.

Lebanon and France postponed on Sunday an upcoming conference to support the Lebanese Army and security forces, a joint statement by both countries' presidencies said, citing unfavorable conditions in the region.

Thousands of Hezbollah supporters gathered in Beirut's southern suburbs to mourn Iran's supreme leader Ayatollah Ali Khamenei on Sunday, chanting "death to America, death to Israel" while crying over the killed figure.

Hezbollah vowed Sunday to confront the United States and Israel over their strikes on the group's key backer Iran.

"We will undertake our duty of confronting the aggression," Hezbollah chief Sheikh Naim Qassem said in a statement, adding that his group would not leave "the field of honor and resistance".

The U.S. ambassador to Lebanon informed the country that Israel had no intention of escalating hostilities as long as no attacks were launched from Lebanon, the Lebanese presidency said in a statement.

The message came as Lebanese authorities fear Iran-backed Hezbollah could become embroiled in renewed conflict with Israel after the U.S. and Israel bombed Iran on Saturday and Tehran responded with missile attacks.

Lebanon's Iran-backed Hezbollah called on Saturday for the Middle East to stand against Israel and the United States' attack on Iran.

In a post on X, United Nations special coordinator for Lebanon Jeanine Hennis-Plasschaert urged "all parties in Lebanon" to "prioritize, in words and actions, the need to shield the country and its people from unfolding regional developments".

The remarks come after Israel and the United States launched strikes against Iran.

President Joseph Aoun urged everyone to show full commitment to national responsibility and to prioritize Lebanon's interests and the Lebanese people above any other consideration, after Israel and the United States launched strikes on Iran, with fears in Lebanon that Hezbollah joins the fray.

Aoun said that "sparing Lebanon from the disasters and horrors of external conflicts, and safeguarding its sovereignty, security, and stability, are absolute priorities."

Prime Minister Nawaf Salam said Saturday that Lebanon refuses to be dragged into war, after Israel and the United States launched strikes against Iran.

Authorities fear Iran-backed Hezbollah could become involved in the conflict, which saw the U.S. and Israel bomb Iran on Saturday and Tehran respond with missile attacks.

As Lebanon prepares for its parliamentary elections, several media reports and politicians claim that the country is under pressure to postpone the juncture.

Prime Minister Nawaf Salam denied the claims, in an interview Thursday. No one has urged him to hold or to postpone the elections, he said.