Israeli airstrikes hit a school being used by displaced people in central Gaza on Saturday, killing dozens of people, as the country’s negotiators prepared to meet international mediators to discuss a proposed cease-fire.

At least 30 people sheltering at a girls' school in Deir Al-Balah were taken to Al Aqsa Hospital and pronounced dead after a strike that Israel's military said targeted a Hamas command and control center used to store weapons and plan attacks.

Gaza's Health Ministry said at least 11 people had been killed in other strikes on Saturday.

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Near the hospital, Associated Press journalists saw an ambulance rushing through a dusty road as a few people ran in the opposite direction. An injured man lay on a stretcher on the ground. A body covered with a blanket and a dead toddler lay inside the ambulance.

Inside the school, classrooms were in ruins. People were seen searching for victims under the rubble and some were gathering remains of those who were killed.

Earlier, Israel's military ordered the evacuation of a part of a designated humanitarian zone in Gaza ahead of a planned strike on Khan Younis on Saturday.

The evacuation order was in response to rocket fire that Israel said originated from the area. The military said it planned an operation against Hamas militants in the city, including parts of Muwasi, the crowded tent camp in an area where Israel has told thousands of Palestinians to seek refuge throughout the war.

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The planned strike comes a day before officials from the U.S., Egypt, Qatar and Israel are scheduled to meet in Italy to discuss the ongoing hostage and cease-fire negotiations. CIA Director Bill Burns is expected to meet Qatari Prime Minister Mohammed Bin Abdul Rahman al-Thani, Mossad director David Barnea and Egyptian spy chief Abbas Kamel on Sunday, according to officials from the U.S. and Egypt who spoke on condition of anonymity as they were not authorized to discuss the plans.

It’s the second evacuation order issued in a week that has included striking part of the humanitarian zone, a 60-square-kilometer (roughly 20-square-mile) blanketed with tent camps that lack sanitation and medical facilities and have limited access to aid, United Nations and humanitarian groups say. Israel expanded the zone in May to take in people fleeing Rafah, where more than half of Gaza’s population at the time had crowded.

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According to Israeli estimates, about 1.8 million Palestinians are currently sheltering there after being uprooted multiple times in search of safety during Israel’s punishing air and ground campaign. In November, the military said the area could still be struck and that it was "not a safe zone, but it is a safer place than any other" in Gaza.

The U.N. agency for Palestinian refugees, known as UNRWA, said it was increasingly difficult to know how many people would be affected by the evacuation order because those sheltering under there were constantly being displaced.

"Referring to the orders as evacuation orders don’t do any justice to what this means," said Juliette Touma, the agency's director of communications. "These are forced displacement orders. What happens is when people have these orders, they have very little time to move."

Further north, Palestinians mourned the deaths of seven killed by Israeli airstrikes overnight on Zawaida, in central Gaza. Members of two families — parents and their two children as well as a mother and her two children — were wrapped in traditional Islamic white burial shrouds as community members gathered to perform funeral rights. As men lined up to pray in front of the bodies, weeping friends and neighbors approached individually to pay their final respects.

Deir al-Balah’s Al Aqsa hospital confirmed the count and Associated Press journalists saw the bodies.

The war in Gaza has killed more than 39,100 Palestinians, according to the territory’s Health Ministry, which doesn’t distinguish between combatants and civilians in its count. The U.N. estimated in February that some 17,000 children in the territory are now unaccompanied, and the number is likely to have grown since.

The war began with an assault by Hamas militants on southern Israel on Oct. 7 that killed 1,200 people, most of them civilians, and took about 250 hostages. About 115 are still in Gaza, about a third of them believed to be dead, according to Israeli authorities.

Gun control activists are ramping up spending to elect presumptive Democratic nominee Kamala Harris president and help Democrats capture the House of Representatives in November. 

GIFFORDS, a gun violence prevention group founded by former Congresswoman Gabrielle Giffords, on Friday announced a $15 million campaign targeting battleground state voters. The ad buy is for television, digital advertising and direct mail, as well as for sending Giffords and surrogates to stump for Harris and down-ballot candidates who support tougher gun laws. 

"With just over 100 days until election day, GIFFORDS will redouble its efforts to support champions who are committed to saving lives — including ensuring that Vice President Kamala Harris becomes the next president of the United States," said Emma Brown, executive director for GIFFORDS.

The multi-million dollar campaign will focus on swing states like Michigan and Arizona for the presidential election, and swing congressional districts in California and New York, which could determine control of the House of Representatives next year, NBC News first reported.

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"Across the country, Americans are crystal clear: they want elected leaders who stand up to the gun lobby and put public safety first," said Brown.

GIFFORDS pointed to internal polling conducted in June that found 70% of American voters in battleground districts are "extremely" or "very" concerned about gun violence. The group argues that key groups of voters — particularly women, Latino and Black Americans — strongly support tougher gun laws and will make the difference in close races if motivated to get to the polls.

"This year is critically important, and we look forward to supporting allies committed to preventing gun violence at every level of government — from the state legislative level to Congress, and giving Vice President Harris effective governing partners when she wins in November," Brown said. 

A Fox News poll conducted in June found that 45% of Americans ranked guns as an "extremely important" issue, making it the 7th most "extremely important" to voters out of a list of 10 issues. The highest-ranked issues were "Future of American democracy" (68%), "Economy" (66%) and "Stability and normalcy" (58%). 

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Erich Pratt, the senior vice president for Gun Owners of America, a Second Amendment group, cast doubt on the contention that gun control is a motivating issue for large swathes of voters.

"It’s undeniable that the policies of Kamala Harris and this administration are responsible for the crime crisis our nation currently faces. Threatened confiscation of common self-defense firearms, coupled with soft on crime officials at the state and local levels in major urban centers across the country, have not helped Americans feel safe," Pratt told Fox News Digital in a statement. 

"If groups like GIFFORDS really cared about reducing violence, they’d be urging Harris, a former prosecutor herself, to mobilize U.S. attorneys offices against violent criminals. But instead, they would prefer to push unconstitutional disarmament that leaves everyday Americans defenseless. That won’t play well with swing state voters."

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Gabrielle Giffords, a former Democratic representative from Arizona, was grievously wounded in a 2011 assassination attempt when a gunman shot her in the head at an event in her district. The former congresswoman co-founded her eponymous group a decade ago to "end the gun lobby's stranglehold on our political system," according to the GIFFORDS website. 

Her husband is Sen. Mark Kelly, D-Ariz., who is reportedly one of the top contenders to be Harris' running mate. 

Giffords appeared at an event for Harris on Thursday at the Salt & Light church in Pennsylvania, where she met with community activists in Philadelphia. The predominantly Black neighborhood where she spoke has been impacted by gun violence, including an incident last weekend in which three people were killed and at least six others wounded. 

Giffords spoke briefly about her long recovery from the shooting in 2011, which killed six people during a meeting with constituents at a Tucson grocery store. Harris’ other surrogates, including Pennsylvania House Speaker Joanna McClinton, framed the November presidential contest as a choice between Harris, who would sign a ban on assault weapons, and more gun violence under Republican Donald Trump, who gun-rights groups back.

"We are overwhelmed with violence all across America from rural Pennsylvania to inner city neighborhoods like where we are today," McClinton said. "We as voters can make a decision on having a more violent United States or safer communities in every part of America."

Both Giffords and McClinton, an ally to Gov. Josh Shapiro, who is also under consideration for the Democratic vice presidential nomination — dodged questions about the veepstakes. Giffords aides told the Associated Press the event had long been planned before President Biden dropped out and endorsed Harris for his job, and certainly before her husband emerged as a potential candidate to run on the 2024 ticket. 

The Associated Press contributed to this report.