The United States vowed on Monday it would continue to arm Israel in its campaign against Hamas, even as it called for more humanitarian aid for Palestinians in the devastated Gaza Strip.
Fighting raged on in the third month of the bloodiest ever Gaza war, with the Hamas-run health ministry reporting another 110 people killed in strikes on the Jabalia camp near Gaza City.
The UN Security Council in New York was set to vote later on Monday on another call for a ceasefire in the besieged territory, after previous bids were vetoed by Israel's key ally the US.
Visiting Israel, US Defence Secretary Lloyd Austin said: "We must get more humanitarian assistance in to the nearly two million displaced people in Gaza and we must distribute that aid better."
But he confirmed Washington was "Israel's greatest friend" and would continue to provide "critical munitions, tactical vehicles and air defence systems."
He added that his visit did not aim to "dictate timelines or terms" for the war.
Austin is touring the Middle East as concerns grow over the war's spread around the region, with Iran-backed Houthi rebels in Yemen attacking international shipping in the Red Sea in solidarity with Hamas.
The war in Gaza began when its Islamist rulers Hamas launched an unprecedented attack on October 7, killing around 1,140 people in Israel, mostly civilians, and abducting 250, according to a tally based on official Israeli figures.
Gaza's health ministry says Israel's military response has killed more than 19,400 people, mostly women and children, while reducing vast areas to rubble.
International alarm has mounted over the plight of 2.4 million Gazans enduring daily bombardment, food and water shortages and mass displacement.
Human Rights Watch charged that Israel "is using starvation of civilians as a method of warfare."
"Israeli forces are deliberately blocking the delivery of water, food and fuel, while wilfully impeding humanitarian assistance, apparently razing agricultural areas," the New York-based NGO said.
Israel responded that HRW was an "anti-Semitic and anti-Israeli organisation."
"Human Rights Watch... did not condemn the attack on Israeli citizens and the massacre of October 7 and has no moral basis to talk about what's going on in Gaza," a foreign ministry spokesman said.
The head of the UN agency for Palestinian refugees, Philippe Lazzarini, earlier said he "would not be surprised if people start dying of hunger, or a combination of hunger, disease, weak immunity."
Israel has approved aid deliveries into Gaza via its Kerem Shalom crossing, aside from the Rafah crossing with Egypt, and dozens of trucks entered through Kerem Shalom on Monday.
Prime Minister Benjamin Netanyahu on Sunday again vowed Israel would destroy Hamas, free the hostages and ensure Gaza will never again become "a centre for terrorism."
The army has reported 129 deaths in Gaza since it launched ground operations in late October.
Israel has accused Hamas of hiding among civilians and in tunnels underneath hospitals, schools, mosques and other civilian infrastructure.
The army released a report on Sunday of part of a vast Hamas tunnel network, big enough to drive vehicles through, featuring rails, power lines, drainage systems and a communications network.
Israel has faced mounting global pressure to either slow, suspend or stop hostilities.
That includes families of the remaining 129 hostages believed held in Gaza, whose anger and fear intensified after Israeli forces mistakenly shot dead three hostages who had escaped their captors.
The trio waved white flags and used food leftovers to write a Hebrew-language message on a white sheet before they were shot, reports said.
Army chief of staff Herzi Halevi, in a message to troops, stressed that if enemy fighters "lay down their arms and raise their hands, we capture them, we don't shoot them."
Qatar, which helped mediate a week-long truce and hostage-prisoner exchange last month, has said there are "ongoing diplomatic efforts to renew the humanitarian pause."
US news platform Axios on Monday reported that Mossad chief David Barnea, CIA director Bill Burns and Qatari Prime Minister Sheikh Mohammed bin Abdulrahman Al Thani met in Warsaw.
As the war rages on, special concern has focused on hospitals, most of which no longer function, and several of which have been the scenes of major fighting.
World Health Organisation chief Tedros Adhanom Ghebreyesus said the UN agency was "appalled by the effective destruction" of northern Gaza's Kamal Adwan hospital. (AFP)