Palestinians in northern Gaza have reported fierce air and artillery strikes as Israeli troops backed by tanks press into the enclave with a ground assault that drew increased international calls for the protection of civilians.
Israeli air strikes hit areas near Gaza City's Shifa and Al-Quds hospitals, and Palestinian militants clashed with Israeli forces in a border area east of the city of Khan Younis, in the enclave's south, Palestinian media reported.
There was no comment from Hamas or the Israeli military on the fighting early on Monday. Reuters was not able to confirm the reports.
The bombardments came hours after Israel released images of battle tanks on the Palestinian enclave's western coast, signalling a potential effort to surround Gaza's main city two days after the Israeli government ordered expanded ground incursions across its eastern border.
Some pictures posted online also appeared to show Israeli soldiers waving an Israeli flag deep inside Gaza.
Israel's self-declared "second phase" of a three-week war against Iranian-backed Hamas militants has largely been kept from public view, with forces moving under darkness and a telecommunications blackout cutting off Palestinians.
The phone and internet cuts appeared to ease on Sunday, but telecoms provider Paltel said that Israeli air strikes again had knocked out internet and phone service in parts of the enclave's northern sections, where Hamas has command centres.
The outages have severely hampered rescue operations for casualties of Israeli barrages.
The reported strikes near hospitals came after the Palestinian Red Crescent said on Sunday it had received warnings from Israeli authorities to immediately evacuate al-Quds hospital, where some 14,000 people have sought shelter.
Israel has accused Hamas of locating command centres and other military infrastructure in Gaza hospitals, something the group denies.
Palestinian officials said around 50,000 people had also taken shelter in Shifa Hospital, adding they were concerned about ongoing Israeli threats to the facility.
Israel has tightened its blockade and bombarded Gaza since Hamas gunmen stormed across the border into Israel on October 7.
Israeli authorities say the militants killed some 1,400 people and took at least 239 hostages.
The stepped-up attacks by Israel coincided with a mounting international outcry for a "humanitarian pause" to allow aid in.
Hamas wants a five-day humanitarian pause in Israel's operations to allow aid and fuel into the besieged Gaza Strip in return for the release of all civilian hostages held by the militants, said the source, speaking on condition of anonymity.
More than half the hostages held by Hamas have foreign passports from 25 countries, including 54 Thai nationals, the Israeli government says.
On Monday, the United Nations Security Council is due to be briefed on the humanitarian situation in Gaza.
The 15-member body has unsuccessfully voted fours times in the past two weeks on draft resolutions that aimed to take action on the war, but the 193-member UN General Assembly voted overwhelmingly on Friday to call for an immediate humanitarian truce.
US President Joe Biden on Sunday pressed Israeli Prime Minister Benjamin Netanyahu in a call to protect civilians in Gaza and to "immediately and significantly increase the flow of humanitarian aid" to the besieged costal enclave, the White House said.
Colonel Elad Goren of COGAT, the Israeli Defence Ministry agency that co-ordinates with the Palestinians, said Israel will allow a dramatic increase in aid to Gaza in coming days and Palestinian civilians should head to a "humanitarian zone" in the south of the tiny territory.
Medical authorities in the Gaza Strip, which has a population of 2.3 million people, said on Sunday 8005 people - including 3324 minors - had been killed.
Israel has vowed to annihilate Hamas, a task that it described as necessitating protracted ground assaults in, around and under Gaza City, where the militants have an extensive subterranean bunker network.
There are fears too of regional overspill to the Gaza war, including in Lebanon where the Israeli army and Iranian-backed Hezbollah group have been exchanging fire.
Australian Associated Press