Eight people were killed Sunday in an Israeli airstrike on the UNRWA headquarters in Gaza City, according to the Hamas-run Gaza Ministry of Health.

The IDF said they were targeting Hamas infrastructure and took measures to reduce risk to civilians.

Witnesses told Reuters that the site was used to distribute coupons for aid and distribute water. Video shows a destroyed building and people moving bodies away from the rubble.

-ABC News' Victoria Beaule, Jordana Miller and Sami Zyara

Israeli Prime Minister Benjamin Netanyahu released a statement Sunday claiming there was a "dramatic decrease" in munitions from the United States starting some four months ago, and said he decided to talk about it publicly because of lack of change behind closed doors.

"Since the start of the war, the U.S. has given us support in spirit and in materiel -- defensive and offensive means. But four months ago, there was a dramatic decrease in the munitions coming to Israel from the U.S.," Netanyahu said in the statement. "For long weeks, we turned to our American friends and requested that the shipments be expedited. We did this time and again. We did so at the highest levels, and at all levels, and I want to emphasize -- we did so behind closed doors.

"We received all sorts of explanations, but one thing we did not receive; the basic situation did not change. Certain items arrived sporadically but the munitions at large remained behind," Netanyahu continued.

"After months in which there was no change in this situation, I decided to give this public expression," he said. "We did so out of years of experience and the knowledge that this step was vital to opening the bottleneck."

"In light of what I have heard over the past 24 hours, I hope and believe that this issue will be resolved in the near future," Netanyahu said, in part.

Last week, Netanyahu publicly claimed the Biden administration is broadly withholding military support for Israel amid its ongoing war with Hamas. Biden administration officials flatly denied the allegations.

Netanyahu, referring to a recent meeting with Secretary of State Antony Blinken in Israel, had said he told Blinken, "It's inconceivable that in the past few months, the administration has been withholding weapons and ammunitions to Israel."

Blinken had later declined to relate exactly what was said in private diplomatic conversations and did not deny that he had assured Netanyahu the U.S. was working to remove bottlenecks inhibiting the supply of American arms and ammunition to Israel.

-ABC News' Jordana Miller and Shannon K. Crawford

Strikes in multiple neighborhoods across northern Gaza today have killed 42 people according to Gaza's Civil Defense. Videos from the immediate aftermath of the strike show an entire building leveled, children covered in dust.

A bombing of Al-Shati camp killed 24 people, a bombing in Al-Tufaah killed 18 people -- the number of casualties is likely to increase -- and a bombing in Al-Zaytoun killed 7 people, according to Civil Defense.

Fifty others were injured in the attacks, according to the Hamas media office.

Several others are still trapped under the rubble.

The Israel Defense Forces told ABC News they struck two Hamas military infrastructure sites in Gaza City.

Israeli Prime Minister Benjamin Netanyahu told Punchbowl News that he felt his video publicly accusing the Biden administration of withholding weapons "was absolutely necessary after months of quiet conversation that did not solve the problem."

"We began to see that we had some significant problems emerging a few months ago. And, in fact, we tried, in many, many quiet conversations between our officials and American officials, and between me and the president, to try to iron out this diminution of supply. And we haven’t been able to solve it," Netanyahu said.

"I raised this issue with Secretary [of State Antony] Blinken. And I said that we are being told by our Defense Department officials that barely a trickle is coming in. He said, ‘Well, everything is in process. We’re doing everything to untangle it. And to clear up the bottlenecks,'" Netanyahu continued.

The U.S. has pushed back on Netanyahu's claim, noting that only one shipment of 2,000-pound bombs has been withheld.

White House national security spokesman John Kirby said Thursday that Netanyahu's video "was vexing and disappointing to us -- as much as it was incorrect."

"No other country is doing more to help Israel defend itself," Kirby said.

Netanyahu said in his July 24 remarks to Congress, he plans "to speak to the broad spectrum of the American people and to cull bipartisan support that is still solid in America."

-ABC News’ Molly Nagle and Will Gretsky

A meeting between U.S. and Israeli officials set for Thursday to discuss Iran has been canceled in the wake of Israeli Prime Minister Benjamin Netanyahu’s statement on Tuesday that criticized the U.S. for withholding certain weapons, according to an Israeli source familiar with the discussions.

Israeli officials Tzachi Hanegbi and Ron Dermer were both en route to the U.S. when the strategic meeting was canceled, according to a source in the prime minister's office.

A specific time had not been finalized for the meeting at the time of the cancellation, two U.S. officials told ABC News.

One official said national security adviser Jake Sullivan had been traveling and was looking to reschedule. The U.S. is working with Israeli counterparts to find a different time for the meeting.

Netanyahu said when he met with Secretary of State Antony Blinken in Israel recently, he told Blinken, "It's inconceivable that in the past few months, the administration has been withholding weapons and ammunitions to Israel."

"Israel, America's closest ally, fighting for its life, fighting against Iran and our other common enemies," Netanyahu said. "Secretary Blinken assured me that the administration is working day and night to remove these bottlenecks. I certainly hope that's the case. It should be the case."

U.S. Ambassador to Israel Jack Lew told Netanyahu Tuesday that the ammunition and weapons that he referred to are in the process of being delivered to Israel, according to the prime minister's office.

"With the exception of ongoing discussion regarding large diameter munitions, other items are either delivered or in the process of being delivered, or in the normal review process," the embassy said.

Two U.S. officials involved in approving arms transfers to Israel told ABC News Tuesday that shipments continue to be greenlit as the administration executes on both longstanding orders in the pipeline as well as new requests made after the onset of the war.

The sole exception, the officials said, is the frozen shipment of the 2,000-pound bombs. The officials said the decision to pause that delivery was made by the White House and that, if it’s ultimately lifted, they expect that order will come from the White House, too.

-ABC News’ Selina Wang and Michelle Stoddart