The World Health Organization said its facilities in Gaza had come under Israeli attack, echoing calls from Western countries for an immediate ceasefire as Israel expanded military operations to the central city of Deir el-Balah.

Britain and 24 Western allies, including Australia, Canada, France and Italy, declared on Monday that the war in Gaza "must end now", arguing that civilians' suffering had "reached new depths".

"We urge the parties and the international community to unite in a common effort to bring this terrible conflict to an end, through an immediate, unconditional and permanent ceasefire," the grouping added in a joint statement.

Libya's eastern authorities recently expelled a senior European delegation in a move analysts say was meant to send a message: the unrecognized administration backed by military leader Khalifa Haftar cannot be ignored.

Gaza's civil defense agency and eyewitnesses reported Israeli shelling in the central city of Deir el-Balah on Monday, after the military warned of imminent action in an area where it had not previously operated.

At the main hospital in south Syria's Sweida city, dozens of bodies are still waiting to be identified as the death count of days of sectarian clashes continues to rise.

Tehran on Monday blamed European powers for the failure of the 2015 nuclear deal, accusing them of breaking commitments ahead of renewed talks in Istanbul with Britain, France and Germany.

The U.N. agency for Palestinian refugees said on Monday that it was "receiving desperate messages of starvation" from its Gaza staff, as the Palestinian territory experiences surging levels of hunger.

Visiting U.S. envoy Tom Barrack met Monday with President Joseph Aoun and Prime Minister Nawaf Salam and is scheduled to meet later in the day with political and religious leaders, and on Tuesday with Speaker Nabih Berri.

Tehran said it will host China and Russia on Tuesday for talks on its nuclear program, amid European threats to reimpose sanctions.

"A trilateral consultation" with Russia and China would be held in the Iranian capital to discuss nuclear issues and the potential reimposition of sanctions, foreign ministry spokesman Esmail Baqaei told a news conference on Monday.

Syrian authorities on Monday evacuated Bedouin families from the Druze-majority city of Sweida, after a ceasefire in the southern province halted bloody clashes between the communities, an AFP correspondent and official media said.