The line of cars stretched as far as the eye could see along the coast of southern Lebanon, as residents of areas bombarded in the Israel-Hezbollah war poured into the ancient city of Sidon in search of safety.

President Joseph Aoun on Wednesday said he is clinging to the initiative he has launched to end the Israeli war on Lebanon.

Sara Saleh and her family fled wearing their pyjamas on Wednesday when Israel's military said it would strike a central Beirut building near the school-turned-shelter where they had been staying.

Several other strikes, however, came without warning, jolting terrified residents in the middle of the night and early morning and killing at least 12 people.

Gila Pahima returned to Kiryat Shmona in northern Israel last spring, 18 months after its population had been evacuated because of Hezbollah rocket fire. Now air raid sirens are again sounding around the clock as the boom of missiles and interceptors echoes overhead.

"I feel like we're in constant war," she said. "You feel like you're on a battlefield all day."

Hezbollah said Wednesday it had targeted gatherings of Israeli soldiers near the southern border towns of Aitaroun, Odaisseh, Maroun al-Ras, Mays al-Jabal, Taybeh and Markaba, with artillery shells, rockets and attack drones.

The clashes had prevented Israeli troops from advancing into Lebanese territories, especially from the border town of khiam, one of the closest points to the Litani River, but troops were advancing Wednesday into the southern border towns of Halta and Kfarshouba, media reports said.

France’s special envoy for Lebanon, Jean-Yves Le Drian, speaking to the France Info radio station Wednesday, said the Iran-backed Lebanese militant group Hezbollah "bears full responsibility for the resumption of fighting in Lebanon" but "Israel’s response has been disproportionate and counterproductive, as it unites various actors against Israel."

He criticized Israel for mass evacuation orders that have driven the displacement of more 1 million people in Lebanon and for spurning offers by the Lebanese government to enter into negotiations.

Israeli strikes and shelling targeted overnight into Wednesday several regions in south and east Lebanon, as Israel vowed "big surprises" and escalation.

In the south, strikes targeted Deir al-Zahrani, a hezbollah-affiliated health center in Kherbet Selem, Nabatieh, Tyre, Arab Salim, Kfartebnit, Shawkin-Zebdine, Harouf, Kafra, Burj al-Shamali, Bayt Yahoun, Burj Qalaway, Mayfadoun, Dweir, Shaqra, al-Jmayjmeh, al-Sultanieh, Shebaa, al-Litani, al-Kherdali, al-Abbasiyyah, Deir Qanoun, and Srifa, killing at least 6 and wounding at least 16.

President Joseph Aoun called Wednesday for unity and solidarity and the rejection of division and sectarian provocation, hours after Israel flattened an apartment building in central Beirut and killed ten people in other neighborhoods of the city.

Israel's military claimed the building in Bashoura was being used by Hezbollah to store "millions of dollars intended to finance its activities," without providing evidence. An apartment in the building was hit last week, and the building had also been targeted in the 2024 war.

An Israeli strike on Wednesday hit a car in the center of Sidon, southern Lebanon's largest city, killing two people, including a civil defense rescuer, and wounding another.

An AFP correspondent at the scene said the strike hit near the city's civil defense headquarters and the seaside road, where many displaced people are sleeping in their cars.

Lebanon said Israel struck central Beirut early Wednesday without warning, killing at least twelve people, as the Israeli military announced it was targeting the country's south.

Lebanon's official National News Agency (NNA) said two strikes in the early hours of Wednesday hit an apartment in the central Zoqaq al-Blat neighborhood, a densely populated area close to the government's headquarters and several embassies.