The Israeli army sent out leaflets calling on the civilians in the Al-Jalaa area in northern Khan Younis to evacuate, declaring that the Al-Jalaa neighbourhood will no longer be part of the humanitarian zone as the army is planning to operate there, the Israeli media reported.

The army claimed it is adjusting the humanitarian zone based on “precise intelligence indicating that Hamas has embedded infrastructure in the area.”

This comes amid Israel’s third invasion of Khan Younis, Israeli JPost said.

More than 1.9 million of Gaza’s prewar population of 2.3 million have been driven from their homes, fleeing repeatedly across the territory to escape Israeli attacks.

Most are crowded into tent camps of around 50 square kilometres (19 square miles) on the Gaza coast with few basic services or supplies.

Following an Israeli strike on a Gaza school-turned-shelter on Saturday that killed over 100 Palestinians, many countries around the world denounced the Israeli massacre, renewing calls for an immediate ceasefire.

It was the latest of what the UN human rights office called Israeli “systematic attacks on schools,” bringing the number of such assaults to 21 at least since 4 July which left hundreds dead, including children and women.

“For many, schools are the last resort to find some shelter," the office said after Saturday's attack.

The UN previously said that as of 6 July, 477 out of 564 schools in Gaza had been directly hit or damaged in the Israeli war, adding that Israel has a duty under international law to provide safe shelter for the displaced.

“There’s no justification for these massacres," European Union Foreign Policy Chief Josep Borrell said in a statement on X, referring to strikes on schools.

UK Foreign Minister David Lammy also said he was “appalled."

Meanwhile, the French foreign ministry called the recent number of civilian victims in Israeli strikes on schools “intolerable.”

Moreover, the US said it was deeply concerned about reports of civilians killed.

“Far too many civilians continue to be killed and wounded,” US National Security Council Spokesperson Sean Savett said in a statement.

“Yet again, far too many civilians have been killed,” US Vice President Kamala Harris told reporters travelling with her to Phoenix, Arizona, on Saturday.