An Israeli attack on a UN school complex in central Gaza is raising alarm among U.S. officials after scores of civilians were reportedly killed, despite the apparent use of American-made precision munitions.

The Hamas-run Gaza Ministry of Health said Thursday's airstrike on the school, which has become a makeshift shelter for thousands of displaced people inside the enclave, left at least 40 people dead, including more than a dozen children.

State Department spokesperson Matthew Miller said U.S. officials were in direct contact with the Israeli government about the strike, and its claim its forces were targeting "20 to 30 members of Hamas and other militant groups" and used a "precision strike to target only one part of the building without hitting areas where civilians were sheltering."

But Miller expressed concern about the children reportedly among the dead.

"Certainly, if that it is accurate that 14 children were killed -- those aren't terrorists. And so the government of Israel has said that they're going to release more information about this strike, including the names of those who died in it," Miller said. "We expect them to be fully transparent in making that information public."

PHOTO: Palestinians look at the aftermath of the Israeli strike on a U.N.-run school that killed dozens of people in the Nusseirat refugee camp in the Gaza Strip, June 6, 2024. (Ismael Abu Dayyah/AP)
PHOTO: Palestinians look at the aftermath of the Israeli strike on a U.N.-run school that killed dozens of people in the Nusseirat refugee camp in the Gaza Strip, June 6, 2024. (Ismael Abu Dayyah/AP)

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In late May, another Israeli airstrike on two Hamas targets in Rafah sparked a fire that Gazan authorities say killed at least 45 Palestinians sheltering in a nearby encampment, marking the deadliest incident of Israel's offensive on the enclave's southernmost city.

In both that attack and Thursday's strike on the school, weapons experts tell ABC News that fragments at the sites indicate that American-supplied munitions -- GBU-39 small diameter bombs -- were used.

Although these explosives are designed to have a more limited impact that other arms provided to Israel by the U.S., experts say small diameter munitions can still have a devastating and unpredictable impact in a densely populated area.

PHOTO: Palestinians inspect the site of an Israeli strike on a UNRWA school sheltering displaced people, amid the Israel-Hamas conflict, in Nuseirat refugee camp in the central Gaza Strip, June 6, 2024.  (Abed Khaled/Reuters)
PHOTO: Palestinians inspect the site of an Israeli strike on a UNRWA school sheltering displaced people, amid the Israel-Hamas conflict, in Nuseirat refugee camp in the central Gaza Strip, June 6, 2024. (Abed Khaled/Reuters)

 

A spokesperson for the Israeli military, Daniel Hagari, said the strike in the early hours of Thursday was based on "concrete intelligence" that indicated that militants inside the school were involved in carrying out the Oct. 7 Hamas attack on Israel and were "planning more attacks against Israelis, some of them imminent."

"We stopped a ticking time bomb," Hagari said.

PHOTO: Relatives mourn over the body of a man killed in an Israeli airstrike at a UN school housing displaced Palestinians in Nuseirat, at a hospital ground in Deir el-Balah, June 6, 2024. (Bashar Taleb/AFP via Getty Images)
PHOTO: Relatives mourn over the body of a man killed in an Israeli airstrike at a UN school housing displaced Palestinians in Nuseirat, at a hospital ground in Deir el-Balah, June 6, 2024. (Bashar Taleb/AFP via Getty Images)

 

Miller could not confirm whether American-made weapons were used in Thursday's attack but said that "on a number of occasions" U.S. officials had pressed Israel "to use the most precision weapon possible and the smallest weapon possible to achieve legitimate military gains."

"If it bears true that this strike resulted in the death of 14 children, the results aren't where they need to be," Miller said.

A spokesperson for United Nations Secretary-General António Guterres condemned the strike, saying in a statement "UN premises are inviolable, including during armed conflict and must be protected by all parties at all times."

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Through the Israel-Hamas war, the Biden administration has acknowledged that civilian deaths are an unfortunate consequence of any armed conflict while maintaining that Israel has a right to defend itself, even in some instances involving targets like schools and hospitals that are also being used by combatants -- a grey area of international humanitarian law.

However, the Biden administration's view of what constitutes legitimate military gains may be shifting.

When the president announced the framework for cease-fire deal that would free the scores of hostages imprisoned inside Gaza, he also declared that Israel had degraded Hamas to the point that the militant group is "no longer capable of carrying out another Oct. 7."

PHOTO: Palestinians inspect the site of an Israeli strike on a UNRWA school sheltering displaced people, amid the Israel-Hamas conflict, in Nuseirat refugee camp in the central Gaza Strip, June 6, 2024.  (Abed Khaled/Reuters)
PHOTO: Palestinians inspect the site of an Israeli strike on a UNRWA school sheltering displaced people, amid the Israel-Hamas conflict, in Nuseirat refugee camp in the central Gaza Strip, June 6, 2024. (Abed Khaled/Reuters)

U.S. officials maintain that Israel must retain the ability to address imminent threats, as the Israeli government asserts it did by striking the school. Through the conflict, Israel has not made a consistent practice of sharing intelligence justifying its attacks with its allies or the public.

Still, the Biden administration has generally defended Israel's strikes on civilian centers, noting that Hamas is known to use them as human shields for its fighters.

But Palestinians in Gaza say the end result is that they are left with no refuge from the horrors of war.

Muhammad Bahar, 42, says he was sleeping in the basement of a building in the school complex when it was hit by a missile overnight.

"I can't believe I'm still alive," he told ABC News as he stood beside the rubble.

"They said go to [United Nations Relief Works Agency] schools because they are safe. Since the beginning of the war we have been here," he said. "But this is what happened."

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Israeli strike on UN school in Gaza kills dozens

Palestinians mourn relatives killed at the UN-run school after an Israeli airstrike - Israel bombs UN school as IDF accused of using white phosphorous

Palestinians mourn relatives killed at the UN-run school after an Israeli airstrike -

At least 30 people were killed in an Israeli air strike on a United Nations school in central Gaza where displaced Palestinians were sheltering, local health officials said.

Among the dead were 23 women and children.

The Israel Defence Forces said a “precision strike” had targeted a Hamas compound inside the Al-Sardi school, run by the UN agency for Palestinian refugees (UNRWA).

It said “a number of steps” were taken to reduce harming civilians, including aerial surveillance and “additional intelligence information”.

The strike came as Israel expands its operations across the Gaza Strip while senior regional and US officials struggle to help negotiate a ceasefire plan acceptable to both Israel’s government and Hamas.

Earlier this week, the Israeli military announced a new ground and air assault in central Gaza, targeting Hamas militants who have reemerged in areas that were previously cleared.

The IDF revealed on Wednesday, that it had also recently located and destroyed a major Hamas tunnel in Rafah in southern Gaza, next to the border crossing with Egypt, which it alleged was used by the terror group to smuggle weapons into the Strip.

According to an Axios report, the IDF said the Al-Sardi compound was targeted as Hamas and Islamic Jihad militants who belonged to the elite Nukhba Forces and who took part in the October 7 were operating there.

Witnesses to the pre-dawn strike and hospital officials confirmed multiple civilian casualties among refugees who were bunkered down after previously fleeing Israeli offensives and bombardment in northern Gaza.

Ayman Rashed, a man displaced from Gaza City who had taken refuge at the school, told the Associated Press that the missiles hit classrooms on the second and third floor where families were sleeping.

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Al-Sardi school
At least 30 people – among them 23 women and children – were killed when missiles hit the school - Shutterstock /Mohammed Saber

He said he helped carry out five dead, including an old man and two children, one with his head shattered open.

“It was dark, with no electricity, and we struggled to get out the victims,” Mr Rashed said.

Hamas has denied that the school contained a hidden command post.

Juliette Touma, UNRWA’s communications director, said its schools or premises have never been used for “military or fighting purposes”.

Al-Sardi school
UNRWA said its schools and premises have never been used for 'military or fighting purposes' - Shutterstock /Mohammed Saber

The strike will add to mounting international criticism over the rising toll of civilian casualties in Gaza in the eight-month war.

At least 45 people were killed in a strike on a tent camp in Rafah last month, when the IDF were also pursuing Hamas members.

On Wednesday, Human Rights Watch accused Israel of using white phosphorus incendiary shells on residential buildings in at least five towns and villages in conflict-hit southern Lebanon, possibly causing “respiratory damage” among civilians and violating international law.

The Israeli military denied the use of the chemical to target civilians and said it was only deployed as a smokescreen. It said it continued to uphold international law regarding munitions.

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