Israel ordered new evacuations in Gaza's southern city of Rafah on Saturday, forcing tens of thousands more people to move as it prepares to expand its operation and adding that it is also moving into an area in northern Gaza where Hamas has regrouped. More than 110,000 people have evacuated Rafah, the United Nations says, more than doubling in the past few days. 

Israel has now evacuated the eastern third of Rafah, pushing the operation to the edges of the heavily populated central area, although Israel's move into the city has so far been short of the full-scale invasion that it planned.

The order comes in the face of heavy international opposition and criticism. President Biden has already said he will not provide offensive weapons to Israel for Rafah, and on Friday the U.S. said there was "reasonable" evidence that Israel had breached international law protecting civilians in the way it conducted its war against Hamas — the strongest statement that the Biden administration has yet made on the matter.

Mr. Biden, speaking at a campaign event Saturday in the Seattle area, said "there would be a cease-fire tomorrow if Hamas would release the hostages, the women, and the elderly, and the wounded. As I've said, it's up to Hamas — if they wanted to do it, we could end it tomorrow. And the cease-fire would begin tomorrow."

The United Nations and other agencies have warned for weeks that an Israeli assault on Rafah, which borders Egypt near the main aid entry points, would cripple humanitarian operations and cause a disastrous surge in civilian casualties.

More than 1.4 million Palestinians — half of Gaza's population — have been sheltering in Rafah, most after fleeing Israel's offensives elsewhere. Considered the last refuge in the strip, the evacuations are forcing people to return north where areas are devastated by previous Israeli attacks. 

People have been displaced multiple times and there are few places left in the embattled strip to move to. Those fleeing fighting earlier this week erected new tent camps in the city of Khan Younis — which was half destroyed in an earlier Israeli offensive — and the city of Deir al-Balah, straining infrastructure.

Israel's military ordered Palestinians in the eastern part of the Gaza Strip city of Rafah to evacuate Monday ahead of a ground offensive long promised by the Jewish state's leaders. The message was delivered with fliers, phone calls, messages and media broadcasts in Arabic after a weekend that saw hope for a new cease-fire in the seven-month Israel-Hamas war dashed yet again. 

People quickly started fleeing from the eastern part of Rafah on Monday, on foot or by any other means available to them. There were reports of Israeli airstrikes hitting eastern Rafah just hours after the evacuation order was given, but the military did not immediately confirm any new strikes on the crowded city.

Georgios Petropoulos, an official with the U.N. Office for Coordination of Humanitarian Affairs in Rafah, said humanitarian workers had no supplies to help them set up in new locations. "We simply have no tents, we have no blankets, no bedding, none of the items that you would expect a population on the move to be able to get from the humanitarian system," he said.

Israeli troops have captured the Gaza side of the Rafah crossing with Egypt, forcing it to shut down. Rafah was the main point of entry for fuel.

The World Food Program has warned that it will run out of food for distribution in southern Gaza by Saturday, Petropoulos said. Aid groups have said fuel will also be depleted soon, forcing hospitals to shut down critical operations and bringing to a halt trucks delivering aid across south and central Gaza.

Heavy fighting is also underway in northern Gaza, where Hamas appeared to have once again regrouped in an area where Israel has already launched punishing assaults. Israeli Army spokesman Avichay Adraee told Palestinians in Jabaliya and Beit Lahiya cities and the surrounding areas to leave their homes and head to shelters in the west of Gaza City, warning that people were in "a dangerous combat zone" and that Israel was going to strike with "great force."

Battles erupted this week in the Zeitoun area on the outskirts of Gaza City. Northern Gaza was the first target of the ground offensive. Israel said late last year that it had mostly dismantled Hamas in the area.

Meanwhile, Secretary of State Antony Blinken delivered to Congress on Friday a highly anticipated report on the Israeli military's operations in Gaza that accused Israeli forces of potentially violating international humanitarian law but did not formally find they had already done so, according to the document's key findings. 

On Saturday, CBS News received a response from Israel regarding the 46-page, declassified report, which is a compendium of views from bureaus and diplomatic officials from across the State Department and includes input from the Pentagon and White House. 

The memorandum, known as NSM-20, required written commitments within 180 days from the more than 100 countries that currently receive U.S. military aid that the weapons are being used in accordance with U.S. and international humanitarian law and that the countries would duly facilitate the delivery of U.S. humanitarian assistance. Those in active conflict — including Israel, Ukraine, Nigeria, Somalia, Iraq, Colombia and Kenya — faced a shorter, 45-day deadline of March 24 to submit their assurances.

According to Ophir Falk, foreign policy adviser to Prime Minister Benjamin Netanyahu, "The IDF takes extensive and unprecedented measures to avert civilian casualties. These include making millions of phone calls and sending text messages to Gaza's civilians warning them to get out of harm's way before Israeli military action, providing maps of safe zones to these civilians, enabling humanitarian corridors and the surge in the amount of food, water and medicine to enter Gaza. This is unprecedented in urban warfare."

The United Nations agency supporting people in Gaza, known as UNRWA, said that some 300,000 people have been affected by evacuation orders in Rafah and Jabaliya, but the numbers could likely be more as these are very built-up areas.

"We're extremely concerned that these evacuation orders have come both towards central Rafah and Jabaliya," Louise Wateridge, UNRWA spokesperson in Rafah, told The Associated Press.

In Rafah's Shaboura neighborhood, Palestinians were busy packing their belongings, readying to the flee the area. Palestinians are being sent to what Israel has called humanitarian safe zones along the Muwasi coastal strip in Gaza. But the zone is already packed with some 450,000 people and conditions there are squalid with the garbage-strewn camp lacking basic facilities.

Meanwhile, strikes are continuing across Gaza.

At least 19 people, including eight women and eight children, were killed overnight in central Gaza in strikes that hit the areas of Zawaida, Maghazi and Deir al Balah, according to Al Aqsa Martyrs Hospital in Deir al Balah and an Associated Press journalist who counted the bodies.

Israel's bombardment and ground offensives in Gaza have killed more than 34,800 Palestinians, mostly women and children, according to the Gaza Health Ministry, which does not distinguish between civilians and combatants in its figures.

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Mednick reported from Tel Aviv and Magdy reported from Cairo. Jack Jeffery in Jerusalem contributed.

In:
• Israel
• Gaza Strip
• Rafah