Israel struck Gaza on Sunday and troops were battling militants in several areas of the Hamas-run territory, where the health ministry said the death count in the war had exceeded 35,000 people.
More than seven months into the Israel-Hamas war, UN chief Antonio Guterres urged "an immediate humanitarian ceasefire, the unconditional release of all hostages and an immediate surge in humanitarian aid" into the besieged Gaza Strip.
"But a ceasefire will only be the start," Guterres told a donor conference in Kuwait. "It will be a long road back from the devastation and trauma of this war."
As Egyptian, Qatari and US mediation efforts towards a truce appeared to stall, US President Joe Biden said on Saturday a ceasefire could be achieved "tomorrow" if Hamas released the hostages held in Gaza since the October 7 attack that sparked the conflict.
AFP correspondents, witnesses and medics said Israeli air strikes pounded parts of northern, central and southern Gaza during the night and into Sunday morning.
The Israeli military said its jets had hit "over 150 terror targets throughout the Gaza Strip" over the past day.
In Rafah, Gaza's southernmost city which sits on the border with Egypt, the Kuwaiti hospital said Sunday it had received the bodies of "18 martyrs" killed in Israeli strikes over the past 24 hours.
The health ministry in the territory said that at least 63 people had been killed over the last 24 hours, bringing the overall death count from Israel's bombardment and offensive in Gaza to at least 35,034 people, mostly women and children.
The war began with Hamas's unprecedented October 7 attack on Israel, which resulted in the deaths of more than 1,170 people, mostly civilians, according to an AFP tally of Israeli official figures.
The militants also seized hostages, of whom scores were freed during a one-week truce in November. Israel estimates 128 captives remain in Gaza, including 36 who the military says are dead.
Fighting in northern Gaza
Months after Israel said it had dismantled Hamas's command structure in northern Gaza, fighting has resumed in recent days in Jabalia refugee camp and Gaza City's Zeitun neighbourhood.
Military spokesman Rear Admiral Daniel Hagari said late on Saturday that "in recent weeks we have identified attempts by Hamas to rebuild its military capabilities in Jabalia, and we are acting to destroy these attempts". He also said there was an operation in Zeitun.
The military said on Sunday its troops were operating in Jabalia after launching an operation overnight.
AFP correspondents reported intense clashes and heavy gunfire from Israeli helicopters in the Zeitun area early Sunday, with medics and witnesses saying troops were fighting in Zeitun as well as Jabalia.
Israel defied international opposition this week and sent tanks and troops into eastern Rafah, effectively shutting a key aid crossing.
On Saturday, the Israeli military expanded an evacuation order for eastern Rafah and said 300,000 Palestinians had left the area.
The UN agency for Palestinian refugees, UNRWA, gave a similar estimate of "around 300,000 people" who have fled Rafah over the past week, decrying in a post on X the "forced and inhumane displacement of Palestinians" who have "nowhere safe to go" in Gaza.
And the UN's human rights chief Volker Turk on Sunday warned that the evacuation orders, "much less a full assault", could not be "reconciled with the binding requirements of international law" or two recent rulings by the International Court of Justice on Israel's conduct of the war.
'No safe place'
Palestinians in Rafah, many of them displaced by the fighting elsewhere in the territory, piled water tanks, mattresses and other belongings onto vehicles and prepared to flee again.
"The artillery shelling didn't stop at all" for several days, said Mohammed Hamad, 24, who has left eastern Rafah for the city's west.
"We will not move until we feel that the danger is advancing to the west," he told AFP.
"There is no safe place in Gaza where we can take refuge."
Residents were told to go to the "humanitarian zone" of Al-Mawasi on the coast northwest of Rafah, though aid groups have warned it was not ready for an influx of people.
EU chief Charles Michel said on social media that Rafah civilians were being ordered to "unsafe zones", denouncing it as "unacceptable".
Hisham Adwan, spokesman for the Gaza crossings authority, told AFP on Sunday that the Rafah crossing has remained closed since Israeli troops seized its Palestinian side on Tuesday, "preventing the entry of humanitarian aid" and the departure of patients needing medical care.
He said Israeli forces "have advanced from the eastern border" about 2.5 kilometres (1.6 miles) into Rafah.
At the Kerem Shalom crossing, site of multiple clashes, the army said it had intercepted two launches fired at the crossing from Rafah.
Protests
Israel began what it termed a "limited" operation in Rafah this week, while the international community has repeatedly condemned the possibility, long-threatened by the Israeli government, of a full-scale ground invasion of the city.
Israel's close ally the United States paused the delivery of 3,500 bombs as it appeared ready to invade Rafah.
Protests against the war spread to Saturday's Eurovision Song Contest in Sweden, where thousands rallied outside the Malmo Arena condemning Israel's participation.
Meanwhile, in Tel Aviv on Saturday, Israeli protesters again took to the streets to pressure their government to do more to reach a truce and hostage release deal.
The rally came hours after Hamas's armed wing said a hostage, Israeli-British man Nadav Popplewell, had died in captivity. The Israeli military did not offer any comment on the Hamas video statement.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
