Israel intensified its attacks across Gaza Saturday and expanded its evacuation orders in southern Gaza, a day after the United Nations Security Council failed to pass a proposed resolution calling for an immediate humanitarian cease-fire in the war between Israel and the U.S.-designated terror group Hamas.

Israel ordered residents Saturday to evacuate the center of Gaza's main southern city, Khan Younis, while the dead and wounded are piling up at the overwhelmed Nasser hospital there.

Israel Expands Its Military Operation Across Gaza

So far, the vast majority of Gaza's 2.3 million residents already have been forced from their homes, many fleeing several times. With fighting raging across the length of the territory, residents and U.N. agencies say there is effectively nowhere safe to go now. Israel disputes this.

Israel Expands Its Military Operation Across Gaza

The World Health Organization's executive board is scheduled to meet Sunday to discuss the health situation in Gaza.

Israel Expands Its Military Operation Across Gaza

More than a dozen WHO member states already have expressed "grave concern” about the catastrophic humanitarian situation in the enclave. Gaza residents “are being told to move like human pinballs — ricocheting between ever-smaller slivers of the south, without any of the basics for survival,” U.N. Secretary-General Antonio Guterres said Friday.

"The people of Gaza are looking into the abyss," Guterres said. "The international community must do everything possible to end their ordeal."

Israel’s expanded military operations come on the heels of Washington’s veto of the proposed Security Council resolution Friday, diplomatically isolating it from the rest of the group.

Turkey's ministry of foreign affairs called the impasse a "complete disappointment."

"Our friends once again expressed that America is now alone on this issue, especially in the voting held at the United Nations today," Turkish Foreign Minister Hakan Fidan said in an interview Friday with state broadcaster TRT, after he and his counterparts from the Organization of Islamic Cooperation and the Arab League met with U.S. Secretary of State Antony Blinken in Washington.

Agnes Callamard, the secretary-general of the international rights advocacy group Amnesty International also disagreed with the U.S. veto, calling it “morally indefensible and a dereliction of the U.S. duty to prevent atrocity crimes and uphold international law.”

The U.S. reasoning against a cease-fire is that it would allow Hamas to regroup and carry out fresh incursions. Washington instead supports pauses in fighting to protect civilians and allow the release of hostages taken by the militants during the October 7 terror attack on Israel.

Several hundreds of families, friends and supporters of Israeli hostages held by Hamas militants in Gaza rallied Saturday in Tel Aviv at the "Hostages Plaza," calling on the Israeli government to secure the hostages’ release.

Signs of trauma are evident in the small children who were among the hostages released by Hamas.

“They looked like shadows of children,” said Dr. Efrat Bron-Harlev of Schneider Children’s Medical Center in suburban Tel Aviv, who helped treat more than two dozen former captives, most of them youngsters.

Some had not been allowed to bathe during the entirety of their captivity. Many had lost up to 15% of their total weight but were reluctant to eat the food they were served.

Asked why, the answer came in whispers: “Because we have to keep it for later.”

One 13-year-old girl recounted how she’d spent the entirety of captivity believing that her family had abandoned her, a message reinforced by her kidnappers, Bron-Harlev said.

Also Friday, Israel said it had discovered a new tunnel, weapons and Hamas facilities under Gaza — evidence, it says, that Hamas, carries out military operations through an extensive network running underneath civilian infrastructure.

The military did not provide video or photo evidence of the kilometer-long tunnel extending from the campus of Al-Azhar University in Gaza to a nearby school, but it released photos of weapons soldiers allegedly found at the university, including explosives and rocket parts.

The military said it also found a Hamas control room with cameras, phones, walkie-talkies and weapons near a hospital in northern Gaza, as well as an additional tunnel entrance. A photo released by the military showed an opening to an underground passageway with a ladder stretching downward.

Israel said such discoveries show that Hamas is entrenched in civilian areas — a claim central to its justification for intensifying its attacks on the enclave and calling for more mass evacuations on civilian areas there.