Iran's Foreign Minister Abbas Araghchi said on Thursday that Tehran will not exercise any restraint if energy facilities were attacked in the war with United States and Israel again.

"Our response to Israel's attack on our infrastructure employed FRACTION of our power. The ONLY reason for restraint was respect for requested de-escalation," said Araghchi in a post on X.

US Defense Secretary Pete Hegseth said Thursday there is no "time frame" for ending the US-Israeli war against Iran, which was launched three weeks ago.

Hezbollah said on Thursday its fighters were battling Israeli forces in south Lebanon, as a military source on the ground said Israeli troops were slowly advancing while "systematically destroying" border towns.

Hezbollah said it targeted overnight into Thursday Kiryat Shmona, Kfar Yuval, Misgav Am, Dishon, Manara, Naharaya, Haifa and Kfar Giladi in north Israel and Israeli soldiers and Merkava tanks near the southern border towns of Houla, Taybeh, Aitaroun, Odaisseh, Rob Tlatine, Alma al-Shaab and Markaba with rockets, artillery shells and attack drones.

Israeli strikes targeted overnight into Thursday Mayfadoun, al-Naqoura, al-Qantara, Tyre, al-Hosh, Insariyeh, al-Bazourieh, al-Rihan, Tayr Debba, Debaal, the border town of al-Khiam and a bridge in Qasmiyeh in south Lebanon. Artillery shelled Arnoun, al-Ghandourieh, Maroun al-Rass, Bint Jbeil, Ibl al-Seqi and wadi al-Slouqi.

At least four people were killed and ten were wounded in the strikes on the south, the National News Agency said.

Saudi Arabia has not ruled out military action in response to repeated missile and drone attacks from Iran, Foreign Minister Prince Faisal bin Farhan said on Thursday.

Speaking to reporters following a meeting in Riyadh of foreign ministers from the region, Prince Faisal said that Iran "tries to pressure its neighbors" with attacks.

Israeli dairy and fruit farmer Tommy Kurlender refused to abandon his herd during the last war with Hezbollah, and vowed he would again stay put this time around.

The Israel-Lebanon border area has once again come under fire since Hezbollah launched attacks in support of its backers in Tehran, after Israel killed supreme leader Ayatollah Ali Khamenei.

Almost 120,000 Syrians have returned to their country from neighboring Lebanon since the latest war erupted between Israel and Hezbollah, according to International Organization for Migration figures provided to AFP on Wednesday.

"As of 17 March, 125,784 people have entered Syria from Lebanon" since the fighting there began, "about 119,000 of whom are Syrians", according to the figures from the UN agency's Displacement Tracking Matrix.

Lebanese militant group Hezbollah condemned Wednesday Israel's killing of Iranian national security chief Ali Larijani, calling it "cowardly".

"We in Hezbollah, as we condemn this cowardly assassination and the ongoing criminal American–Israeli aggression, affirm that the assassination of leaders will neither break the will of the Islamic Republic nor undermine the determination of its leadership, its people, and its fighters," the Iran-backed group said.

The European Union has called on Israel to cease its military campaign in Lebanon, after the latest Israeli strikes on Beirut.

"The EU is deeply concerned about the ongoing Israeli offensive in Lebanon which already has devastating humanitarian consequences and risks triggering a prolonged conflict," a spokesperson said in a statement Wednesday.

Kuwait arrested 10 militants affiliated with the Iran-backed Lebanese Hezbollah group on Wednesday, who were accused of plotting "terrorist" actions against vital infrastructure, the interior ministry said.

This was the second Hezbollah-affiliated cell to be arrested in Kuwait this week, as the Gulf faced daily Iranian attacks during the Middle East war, which has seen Tehran-backed groups including Hezbollah join the conflict.