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.

In the wake of Israeli Prime Minister Benjamin Netanyahu’s claims that the U.S. has slowed the flow of weapons, White House national security communications adviser John Kirby said that all the weapons continue to flow except "only one shipment of high-density, low-precision munitions that has been paused."

"Israel continues to get arms and ammunition," Kirby told reporters on Wednesday. "We want to make sure that they have what they need … that commitment will not waver."

Kirby did repeat the administration's message that they are "not going to respond" to all of Netanyahu’s public statements.

Israeli Minister of Defense Yoav Gallant said after his White House meeting with national security adviser Jake Sullivan, "We have made significant progress in addressing force buildup and munition supply."

Asked whether the U.S. would support Israel if the war escalated into a conflict on the northern border with Hezbollah, Kirby said more conflict with Hezbollah is not in Israeli's interest and reiterated America's support for Israel.

“We want to see no second front opened and we want to see if we can resolve the tensions up there through diplomatic processes,” Kirby said.

-ABC News’ Michelle Stoddart