The military later issued an evacuation warning for most of the southern Lebanese city of Tyre and its surroundings.

"Following the sirens that sounded a short while ago in the areas of Yiftah and Ramot Naftali, two projectiles that crossed from Lebanon into Israeli territory were intercepted," the military said.

It later said it "dismantled the launchers used by Hezbollah terrorists to carry out the attack".

There was no immediate comment from the Iran-backed group, which claimed separate attacks against Israeli troops in Lebanon on Sunday.

A ceasefire that was supposed to end the fighting between Israel and Hezbollah took effect on April 17, but has never been fully respected.

Hezbollah and Israel have frequently exchanged accusations of truce violations, with each side justifying its own attacks by citing alleged violations committed by the other side.

A further conditional truce was announced by Lebanese and Israeli envoys this week in Washington.

It would require Hezbollah to stop firing, withdraw from near the Israeli border and would see Lebanon's army deploy to new "pilot zones" in the area, where it would exercise exclusive control.

But Hezbollah, which drew Lebanon into the Middle East war in support of Iran on March 2, has rejected the agreement, demanding a full Israeli withdrawal from Lebanese territory.

Israel has also continued bombing its northern neighbour despite the truce, with Lebanon's state-run National News Agency reporting a series of Israeli strikes across the south, some of them deadly.

Sunday's attacks come a day after at least five people were killed in Israeli strikes according to Lebanese authorities, including three Lebanese soldiers.

Lebanese President Joseph Aoun denounced the attack on his country's soldiers, calling it a "flagrant violation of Lebanese sovereignty".

Israel's extensive campaign of airstrikes and a ground invasion have killed nearly 3,600 people, according to Lebanon's health ministry.

On Saturday, Lebanese army chief Rodolphe Haykal left for Pakistan, the chief mediator between the United States and Iran.

Tehran insists Lebanon be included in any agreement with Washington to end the regional war, and a source with knowledge of the matter told AFP Haykal's visit was linked to Pakistan's efforts to resolve issues in the Middle East war negotiations.