Unknown assailants riding an SUV opened fire overnight towards Kataeb Party’s headquarters in Beirut’s Saifi area, the National News Agency said.

“Security agencies are following up on the issue through the cameras that are fixed at the site in order to identify the car and its type,” NNA said.

Caretaker Prime Minister Najib Mikati on Monday declared three days of national mourning over the death of Iran’s president Ebrahim Raisi, foreign minister Hossein Amir-Abdollahian and a number of officials in a helicopter crash.

According to Mikati’s memo, flags will be flown at half-mast at all public administrations and institutions while radio and TV programming will be adjusted to suit the situation.

Ireland's top diplomat in a visit to Lebanon on Monday expressed his concern over the slow progress in criminal proceedings against several Lebanese men charged with the killing of an Irish peacekeeper in 2022 in the tiny Mediterranean country.

Micheál Martin, Irish foreign and defense minister, said he was "very, very concerned" about the case. He met with Irish peacekeepers in south Lebanon and with Lebanese Foreign Minister Abdallah Bou Habib and a representative of the Lebanese defense ministry.

Four Hezbollah fighters were killed Monday in south Lebanon, with the Iran-backed group announcing a retaliatory attack.

Hezbollah announced the deaths of the four fighters, two of them from al-Naqoura, "on the road to Jerusalem" -- the phrase used for fighters killed by Israel.

Hezbollah mourned Monday the death of Iranian President Ebrahim Raisi and other officials in a helicopter crash, praising him as a "protector" of anti-Israel groups in the region.

"Hezbollah in Lebanon extends its deepest condolences," the group said in a statement, adding that they knew Raisi "closely for a long time" and that he was "a strong supporter, and a staunch defender of our causes... and a protector of the resistance movements".

The head of Hezbollah’s parliamentary bloc, MP Mohammad Raad, said Sunday that his group is “reassured” over the course of its conflict with Israel.

“The resistance is escalating its operations against the Israeli enemy to a certain level in order to preserve the deterrence equation,” Raad said.

A U.S. official has told Al-Arabiya television that neither Israel nor Hezbollah wants to engage in an all-out war.

Palestinian militant group Hamas said that a "commander" was killed in an Israeli strike on an eastern district of Lebanon near the Syrian border.

For displaced south Lebanese villagers, funerals for those killed in months of cross-border clashes are a rare chance to return home and see the devastation caused by Israeli bombardment.

Hezbollah targeted Friday a logistic military base in the occupied Golan heights with 50 Katyusha rockets, in response to al-Najjariyeh strikes.

The group said in a statement it has attacked the Tznobar base in response to the killing of two civilians in a strike on al-Najjarieh, near the coastal city of Sidon.