By Wafaa Shurafa, Jack Jeffery and Sam Magdy, Associated Press

DEIR AL-BALAH, Gaza Strip (AP) — Israel said Tuesday that its troops had entered Gaza’s second-largest city as intensified bombardment sent streams of ambulances and cars racing to hospitals with wounded and dead Palestinians, including children, in a bloody new phase of the war.

The military said its forces were “in the heart” of Khan Younis, which has emerged as the first target in the expanded ground offensive into southern Gaza that Israel says aims to destroy Hamas, which has been designated as a terrorist organization by the United States, Canada and the European Union. Military officials said they were engaged in the “most intense day” of battles since the ground offensive began more than five weeks ago, with heavy firefights also taking place in northern Gaza.

In other developments, Israeli Prime Minister Benjamin Netanyahu said the military would have to retain open-ended security control over the Gaza Strip long after the war ends.

Netanyahu said Gaza would have to be demilitarized and that the only body capable of ensuring that would be the Israeli military.

“No international force can be responsible for this,” he said at a news conference. “I’m not ready to close my eyes and accept any other arrangement.”

The assault into the south is triggering a new wave of displaced Palestinians almost two months into the war, raising warnings from relief groups that they can’t keep up because supplies are insufficient and combat prevents distribution. The U.N. said 1.87 million people — more than 80% of Gaza’s population — have been driven from their homes. New military evacuation orders are squeezing people into ever-smaller areas of the tiny coastal strip’s south.

Bombardment has grown fiercer across the territory, including areas where Palestinians are told to seek safety. In the central Gaza town of Deir al-Balah, just north of Khan Younis, a strike Tuesday destroyed a house where dozens of displaced people were sheltering. At least 34 people were killed, including at least six children, according to an Associated Press reporter at the hospital who counted the bodies.

Footage from the scene showed women screaming from an upper floor of a house shattered to a concrete shell. In the wreckage below, men pulled the limp body of a child from under a slab next to a burning car. At the nearby hospital, medics tried to resuscitate a young boy and girl, bloodied and unmoving on a stretcher.

Under U.S. pressure to prevent further mass casualties, Israel says it is being more precise as it widens its offensive and is taking extra steps to urge civilians to evacuate out of its path. Weeks of bombardment and a ground offensive obliterated much of northern Gaza.

Israel says it must remove Hamas from power to prevent a repeat of the Oct. 7 attack that ignited the war. In the surprise attack, Hamas and other Palestinian militants killed about 1,200 people, mostly civilians, and took captive some 240 men, women and children.

Its assault has killed more than 15,890 people in Gaza — 70% of them women and children — with more than 42,000 wounded, according to the Health Ministry in Gaza. The ministry does not differentiate between civilian and combatant deaths. It says hundreds have been killed or wounded since a weeklong cease-fire ended Friday, and many still are trapped under rubble.

The military accuses Hamas of using civilians as human shields when operating in dense residential areas. But Israel has not provided accounting for targeting in individual strikes, some of which have leveled entire city blocks and complexes of dozens of multi-story apartment towers.

Military Chief of Staff Herzi Halevi acknowledged that Israeli forces use heavy force against civilian structures, saying combatants keep weapons in houses and buildings so fighters in civilian clothes can use them to fire on troops.

“Striking them requires significant use of fire, both to target the enemy but also to, of course, protect our forces,” he said. “Therefore the forces operate powerfully.”

BATTLES IN KHAN YOUNIS AND NORTH GAZA

Halevi said his forces had begun the “third phase of the ground operations,” moving against Hamas in the south after seizing much of the north. Israel has not given specific details on troop movements.

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Residents said troops advanced to Bani Suheila, on Khan Younis’ eastern edge. Israeli forces also appear to be moving to partially cut across the strip between Khan Younis and Deir al-Balah. Satellite photos from Sunday showed around 150 Israeli tanks, armored personnel carriers and other vehicles on the main road between the two cities.

The past days brought some of the heaviest bombardment of the entire war, the U.N.’s humanitarian affairs office OCHA said.

Witnesses said a strike Tuesday hit a school in Khan Younis where hundreds of displaced people were sheltering. Casualties overwhelmed the nearby Nasser Hospital, where wounded men and children were lain on a bloody floor amid a tangle of IV tubes. In the morgue, a woman draped herself over the stretcher where her dead husband and child lay among at least nine bodies.

“What’s happening here is unimaginable,” said Hamza al-Bursh, who lives near the school. “They strike indiscriminately.”

In northern Gaza, the military said its troops were battling Hamas in the Jabaliya refugee camp and the district of Shujaiya, capturing Hamas positions and destroying rocket launchers and underground infrastructure.

The battles in the north signaled the tough resistance from Hamas since Israeli forces moved in on Oct. 27. The military says 86 of its soldiers have been killed in the Gaza offensive and that thousands of Hamas fighters have been killed, though it has not produced evidence.

Even after weeks of bombardment, Hamas’ top leader in Gaza, Yehya Sinwar — whose location is unknown — was able to conduct complex cease-fire negotiations and orchestrate the release of more than 100 Israeli and foreign hostages in exchange for 240 Palestinian prisoners last week. Palestinian militants have also kept up their rocket fire into Israel.

FEWER PLACES TO GO

Israel ordered the full-scale evacuation of northern Gaza in the early days of the war and has barred people who left from returning. An unknown number of people — likely a few hundred thousand — remain in the north, but the rest of Gaza’s population of 2.3 million is squeezed into the 90 square miles of central and southern Gaza.

Since moving into the south, the Israeli military has ordered people out of nearly two dozen neighborhoods in and around Khan Younis. That further reduced the area where civilians can seek refuge by more than a quarter. It was not clear how many people followed the evacuation call.

“Nowhere is safe in Gaza, and there is nowhere left to go,” Lynn Hastings, the U.N. humanitarian coordinator for the Palestinian territories, said Monday. “The conditions required to deliver aid to the people of Gaza do not exist. If possible, an even more hellish scenario is about to unfold.”

For the past two days, aid distribution — mainly just supplies of flour and water — has been possible only in the city of Rafah, at the far south by the border, the U.N. said. Locations deeper inside Gaza, including Khan Younis, Deir al-Balah and northern Gaza, could not be reached because of fighting.

Dr. Nasser Bolbol, head of neonatal intensive care at the European Gaza Hospital in Khan Younis, said acute hunger was spreading, with some deaths of children from dehydration and undernourishment, after nearly two months with only limited aid entering the territory, under an Israeli seal.

“Gaza is entirely covered in death and darkness,” he said.

STILL HOSTAGE

Family members of hostages still held in Gaza held tense talks with Netanyahu and the war cabinet Tuesday. Observers present said more than 100 people attended the nearly three-hour meeting. Some relatives shouted at cabinet members, perceiving they did not have any immediate plans to rescue some 138 hostages still captive. Nearly half the room left in disappointment before the meeting ended.

Family and supporters of Israeli hostages held by Hamas in Gaza gather for a horse ride calling for their return, in a forest near Modiin, Israel, Tuesday, Dec. 5, 2023. The event was organized by the father of Idan Shtivi, one of more than 100 Israeli hostages who taken to Gaza after being abducted in a Hamas cross-border attack on Oct. 7. (AP Photo/Oded Balilty)

During the gathering, five hostages released during the truce shared harrowing details of their experience. One spoke of Hamas fighters “touching” female hostages, and another said militants shaved off a male hostage’s body hair to humiliate him, according to a group representing the hostages’ families. Others said they were deprived of water.

The Associated Press has not been able to verify reports that female and male hostages experienced sexual abuse in Gaza.

“It was not a relaxed discussion,” said Noam Peri, whose 80-year-old father is still hostage. “After 60 days, people are tired and worried.”

Magdy and Jeffery reported from Cairo. Associated Press writers Lee Keath in Cairo and Jon Gambrell in Dubai, United Arab Emirates, contributed.