At a news conference Thursday, Secretary of State Antony Blinken was asked about the gruesome photos and videos shown to him behind closed doors by Israeli Prime Minister Benjamin Netanyahu.

"It’s beyond what anyone would ever want to imagine, much less, God forbid, experience. A baby, an infant -- riddled with bullets. Soldiers beheaded. Young people, burned alive," he said. "I could go on, but it’s simply depravity in the worst imaginable way."

Blinken said that some of the images had been seen before, but others were new to him, and again said that Hamas’ acts harkened back to ISIS.

"I think for any human being to see this -- it’s really beyond almost anything that we can comprehend, digest," Blinken continued. "You can’t help but imagine yourself, your family, your loved ones, your friends in that situation, in that predicament and maybe the best word for it for me is overwhelming."

While some of the claims made by the IDF have been questioned and others have fueled online claims that the Israeli government is spreading disinformation, Blinken said that the photos would ultimately show exactly the horrors its people have confronted and serve to unify through "moral clarity."

-ABC News' Shannon Crawford

The Israel Defense Forces said Thursday that it's responsible for Israel's security and said they failed on Saturday.

The IDF said they'll investigate how the security failure happened, but right now, they're in a time of war.

Fabrizio Carboni, regional director for Near and Middle East for the International Committee of the Red Cross, said hospitals are losing power as Gaza loses power, risking the lives of the elderly on oxygen and newborns in incubators.

"Kidney dialysis stops, and X-rays can’t be taken," Carboni said. "Without electricity, hospitals risk turning into morgues."

Defense Secretary Lloyd Austin told reporters in Brussels Thursday that the U.S. is not placing conditions on its military aid to Israel.

Austin said Israel is "a professional military led by professional leadership" and "we would hope and expect that they would do the right things in the prosecution of their campaign."

Austin said U.S. intelligence had no indication or warning that Hamas was planning such an attack.

Echoing other administration officials, Austin said, "We've not seen any indication that Iran was involved in the planning or the execution of this attack," though he added the U.S. will continue to focus on whether that is truly the case.

Austin said that the U.S. will "work urgently to get Israel what it needs to defend itself," including munitions and Iron Dome interceptors, and said helping Israel won’t affect the U.S. flow of military aid to Ukraine.

-ABC News' Luis Martinez

The first U.S. charter flight to evacuate Americans from Israel has departed the country and is now en route to Europe, John Kirby, spokesperson for the National Security Council, told reporters on Friday. Kirby didn’t provide the exact destination in Europe.

He said more flights are expected to depart "in the coming days" and that "the State Department will continue to organize these charter flights for as long as there is a demand from US citizens for departure assistance."

He said the U.S. is still exploring "other options" to expand evacuation capacity, which also includes an option by sea.

Kirby also spoke to the heightened alert across the U.S.

"I want to be completely and crystal clear on one thing: At this time, none of our intelligence agencies have any specific intelligence indicating a threat to the United States stemming from the Hamas terrorist attack in Israel," Kirby stressed.

-ABC News' Justin Gomez