Ghadir Hajji rushed to a clinic on Sunday in hopes her five children would be among the first to get vaccinated against polio, which has re-emerged in war-ravaged Gaza.

"They absolutely have to be vaccinated," she told AFP as the family waited in line for a vaccine drive announced after health officials reported last month the first case of polio in the besieged territory in a quarter of a century.

"We received text messages from the ministry of health and we showed up right away."

US President Joe Biden said Saturday that the body of Israeli-American hostage Hersh Goldberg-Polin was among six recovered in Gaza by Israeli forces.

"Earlier today, in a tunnel under the city of Rafah, Israeli forces recovered six bodies of hostages held by Hamas," Biden said in a statement.

"We have now confirmed that one of the hostages... was an American citizen, Hersh Goldberg-Polin," the president said, calling his death "as tragic as it is reprehensible."

Concrete slabs and sheet metal were piled high alongside streets in Jenin on Saturday, as residents assessed the damage from Israel's latest West Bank raid even as explosions persisted nearby.

The scars of ongoing clashes in the occupied Palestinian territory, which began on Wednesday as part of what Israel has described as a counter-terrorism operation, were everywhere: collapsed walls, uprooted trees, tiled roofs covering mounds of rubble.

A health official said a polio vaccination campaign began in Gaza on Saturday, while an aid worker said a large-scale rollout would begin on Sunday, coinciding with a "humanitarian pause" agreed by Israel and Hamas.

The vaccination drive was announced after Gaza recorded its first polio case in a quarter of a century earlier this month.

Local health officials along with the UN and NGOs "are starting today the polio vaccination campaign", Moussa Abed, director of primary health care at the health ministry in Hamas-run Gaza, told AFP on Saturday.

Israel's main union on Sunday ordered a nationwide general strike after soldiers recovered the bodies of six killed hostages from the Gaza Strip where the military is battling Palestinian militants.

In the evening, tens of thousands of Israelis gathered in the streets of Tel Aviv and other cities to protest the government and call for a hostage release deal.

The bodies of the six hostages were recovered Saturday "from an underground tunnel in the Rafah area" in southern Gaza, the military said.

Israeli Adam Berdichevsky and his family survived the October 7 Hamas attack and on Friday they and other survivors from their kibbutz watched as he won an emotional opening singles tennis match at the Paralympics in Paris.

"I'm very happy that I could give some good times in these bad days," the 40-year-old said after beating Italy's Luca Arca 6-2, 7-5 in front of around 6,000 spectators on the Suzanne Lenglen court at Roland Garros.

Palestinian residents of the Israeli-occupied West Bank expressed shock and despair Friday at the outcome of an Israeli raid on their refugee camp: bullet-riddled walls, destroyed homes and piles of concrete blocks.

"We are another Gaza, especially in the refugee camps," said Nayef Alaajmeh, a resident of the Nur Shams camp in the city of Tulkarem, as he surveyed the damage following a devastating Israeli raid on the camp that ended late on Thursday.

A top UN aid official on Thursday questioned "what has become of our basic humanity," as the war in Gaza rages and humanitarian operations struggle to respond.

Joyce Msuya, acting head of the UN's humanitarian office (OCHA), said that "we cannot plan more than 24 hours in advance because we struggle to know what supplies we will have, when we will have them or where we will be able to deliver."

"Civilians are hungry. They are thirsty. They are sick. They are homeless. They have been pushed beyond... what any human being should bear," she told the Security Council.

Yemen's Iran-backed Huthi rebels announced Thursday they had booby-trapped and detonated the Greek-flagged oil tanker Sounion, stranded in the Red Sea after a drone and missile attack earlier this month.

The group's leader said the operation took place earlier this week. Since then, the rebels have agreed to allow rescue teams to access the ship.

A video shared on the rebels' media outlets showed masked men planting explosives on the vessel and then detonating them, causing several fires on board.

Naming others is considered a marker of highly advanced cognition in social animals, previously observed only in humans, bottlenose dolphins and African elephants.

Marmoset monkeys have now joined this exclusive club, according to a new study published in Science on Thursday.

The diminutive primates use loud, high-pitched calls to assign each other "vocal labels," as shown in research conducted by a team at the Hebrew University of Jerusalem.