RAFAH, Gaza Strip 鈥 Israel called on civilians to evacuate parts of Rafah on Monday in what appeared to be preparation for a long-threatened assault on Hamas holdouts in the southern Gaza Strip city where more than a million war-displaced Palestinians have been sheltering.

Instructed by Arabic text messages, telephone calls, and flyers to move to what the Israeli military called an 鈥渆xpanded humanitarian zone鈥 20 km away, some Palestinian families lumbered out under chilly spring rain, witnesses said.

Israel鈥檚 military said it had begun encouraging residents of Rafah to in a 鈥渓imited scope鈥 operation. It gave no specific reasons, nor did it say if any offensive action might follow.

Seven months into its war against Hamas, Israel has been threatening to launch incursions in Rafah, which it says harbors thousands of Hamas fighters and potentially dozens of hostages. Victory is impossible without taking Rafah, it says.

The prospect of a high-casualty operation worries Western powers and neighboring Egypt, which is trying to mediate a new round of truce talks between Israel and Hamas under which the Palestinian Islamist group might free some hostages.

The Rafah plan has opened an unusually public rift between Israel and Washington. Speaking to his US counterpart, Israeli Defense Minister Yoav Gallant linked Monday鈥檚 operation to the deadlock in indirect diplomacy, which he blamed on Hamas.

鈥淒uring their discussion, Mr. Gallant discussed the efforts undertaken to achieve the release of hostages and indicated that at this stage, Hamas refuses the frameworks at hand,鈥 the Israeli Defense Ministry said in a statement.

鈥淕allant emphasized that military action is required, including in the area of Rafah, at the lack of an alternative,鈥 it added

On Monday, the Israeli military called on Palestinians in eastern parts of Rafah to move to a nearby 鈥渉umanitarian area,鈥 saying it would 鈥渆ncourage … the gradual movement of civilians in the specified areas.鈥

An Israeli broadcaster, Army Radio, said evacuations were focused on a few peripheral districts of Rafah, from which evacuees would be directed to tent cities in nearby Khan Younis and Al Muwassi.

Many residents in Rafah said they had received telephone calls to evacuate their homes in the targeted area, in line with the army announcement.

In an overnight aerial attack on Rafah, Israeli planes hit 10 houses, killing 20 people and wounding several, medical officials said.

Three Israeli soldiers were killed on Sunday in a Hamas rocket attack near Rafah, at the Kerem Shalom crossing into Gaza, while Palestinian health officials said at least 19 people were killed by Israeli fire.

Sunday鈥檚 crossing attack came as for ceasefire talks in Cairo, with Hamas reiterating its demand for an end to the war in exchange for the freeing of hostages, and Israeli Prime Minister flatly ruling that out.

The war began after Hamas stunned Israel with a cross-border raid on Oct. 7 in which 1,200 people were killed and 252 hostages taken, according to Israeli tallies.

More than 34,600 Palestinians have been killed, 29 of them in the past 24 hours, and more than 77,000 have been wounded in Israel鈥檚 assault, according to Gaza鈥檚 health ministry.

On Sunday, a top UN official accused Israel of continuing to deny the United Nations humanitarian access in the , where the UN food chief warned a 鈥渇ull-blown famine鈥 has taken hold in the north of the enclave of 2.3 million people.

While not a , World Food Program Executive Director Cindy McCain said, in an NBC News interview broadcast on Sunday, that based on the 鈥渉orror鈥 on the ground: 鈥淭here is famine, full-blown famine, in the north, and it鈥檚 moving its way south.鈥 鈥 Reuters