Antonio Guterres meets with Palestinian children evacuated from the Gaza Strip at the general hospital in Al Arish, Egypt, on Sunday. Reuters

Air and artillery strikes pounded targets in Gaza Sunday as UN chief Antonio Guterres called for a surge of aid into the besieged territory he said was stalked by "horror and starvation".

Other world leaders added their voices to that of Guterres in appealing for an immediate ceasefire and a halt to Israeli plans to send in troops against Palestinian group Hamas in Gaza's crowded southern city of Rafah.

Talks aimed at a deal for a truce and release of hostages were taking place in Qatar but the heads of the Israeli and US spy agencies involved in the negotiations have now left the Gulf emirate for consultations, an informed source told the media.

The health ministry in the Hamas-run Gaza Strip said Sunday that another 84 people had been killed over the previous 24 hours, raising the total death toll in the territory during nearly six months of war to 32,226, most of them women and children.

The Gaza war began with an unprecedented Hamas attack on October 7 that resulted in about 1,160 deaths in Israel, mostly civilians, according to an AFP tally based on official Israeli figures.

Antonio Guterres meets with a woman evacuated from the Gaza Strip receiving treatment in El-Arish in Egypt. AFP

Israel has vowed to destroy the Hamas, who also seized about 250 hostages, of whom Israel believes around 130 remain in Gaza, including 33 presumed dead.

Palestinian children, some with heads bandaged, others more severely wounded in the latest bombardments, were rescued from the rubble of collapsed buildings and rushed to Al-Najjar hospital in Rafah.

Guterres, on a visit to Egypt, urged an end to the "non-stop nightmare" endured by Gaza's 2.4 million people in the territory's worst-ever war.

"Looking at Gaza, it almost appears that the four horsemen of war, famine, conquest and death are galloping across it," the UN secretary-general said, visiting during the Muslim holy month of Ramadan.

"The whole world recognises that it's past time to silence the guns and ensure an immediate humanitarian ceasefire."

With the United Nations warning of imminent famine in Gaza, Guterres urged Israel to allow in more humanitarian aid via the Rafah border crossing whose Egyptian side he visited, saying trucks were "blocked".

On social media, Israel's military responded that the UN should scale up its logistics and "stop blaming Israel for its own failures".

Agence France-Presse