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The Israeli military says air strikes in Lebanon are targeting Hezbollah infrastructure.
It regularly adds it wants to ensure the safe return of tens of thousands of residents of Israeli border areas displaced by attacks from the Iran-backed group.
About 60,000 people have been evacuated from northern Israel because of near-daily attacks by Hezbollah. But some rockets have reached further south and damaged homes in and around the coastal city of Haifa.
On the Lebanese side, many Israeli air strikes targeted the city of Tyre, the Bekaa Valley, and Beirut, according to the BBC’s analysis of the latest monthly data collected by Acled.
Lebanon's government says up to 1.3 million people have been internally displaced, whilst Prime Minister Najib Mikati warned of the "largest displacement” in the country's history.
The Israel Defense Forces (IDF) has been issuing evacuation orders to residents across the country, including areas of Beirut.
In the south, the army instructed residents of several villages to leave their homes and "immediately head north of the Awali River," which meets the coast about 50 km (30 miles) from the Israeli border.
“This is a humanitarian catastrophe,” Gabriel Karlsson, Middle East Manager at the British Red Cross in Beirut, told the BBC.
He said there are insufficient shelters to accommodate so many evacuees.
“I saw children sleeping in the streets,” Karlsson added, urging humanitarian organisations to coordinate their efforts to address the escalating crisis.
Lebanese officials say at least 2,350 have been killed and over 10,000 injured in Israeli attacks. The Lebanon health minister said many casualties were civilians.
On the Israeli side, 60 people have been killed and more than 570 wounded by Hezbollah attacks, Israeli authorities say.
“Collateral damage is inevitable in war”, Amos Yadlin, the former head of Israeli military intelligence, told the BBC.
The retired major-general blamed Hezbollah for the war and claimed Israel’s ground offensive would force the group out from the border areas.
Zwijnenburg, from the Pax for Peace organisation, however, has warned of the impact of Israel’s military campaign on civilians and the populated areas.
“The heavy blast radius kills and maims civilians nearby”, he said, in reference to Israeli air strikes.
“Open-source data combined with satellite imagery also showed that civilian infrastructure such as irrigation channels, gas stations and electricity grids were damaged, which is worsening the humanitarian situation,” he added.
Additional reporting by Paul Cusiac and Maria Rashed