The Israel Defense Forces said its fighter jets have killed Iman Nofal, a senior Hamas member who was a former leader of Hamas' military intelligence.

Gaza hospitals are estimated to have less than 24 hours of fuel left, according to the United Nations Relief and Works Agency.

President Joe Biden departs for the Middle East on Tuesday for in-person meetings with Israeli and Arab leaders amid concerns of an expanded conflict in the Israel-Hamas war.

National Security Council spokesman John Kirby told "Good Morning America" that Biden's focus is on the hostage situation, to make sure humanitarian aid can flow to civilians in Gaza, and to get an update from Israeli counterparts on their plans and ground operations.

Asked about safety concerns, Kirby said "there’s always a concern" wherever the president goes, and those concerns would be "appropriately addressed through the necessary force protection and personnel protection measures. "

Asked if Biden's visit also includes urging Israel to avoid a full-scale ground invasion of Gaza, Kirby reiterated that the U.S. is not telling the Israeli military how to operate but that civilians should be protected.

Kirby added that it's "vital" that the administration gets supplemental funding from Congress for Israel and Ukraine.

-ABC News' Justin Gomez

The Egyptian Food Bank has nearly 3,000 tons of aid, including food, medicine and blankets, ready to cross into Gaza to help its trapped residents, its CEO said. But for now, the trucks are sitting still as the Gaza-Egypt border remains closed.

Mohsen Sarhan, the CEO of the Egyptian Food Bank, told ABC News he went to the border on Tuesday morning.

"You can see people dying, like, few miles away from you," he said. "Everyone in the world knows that these people have run out of water, and they have run out of medicine and have they have run out of food. And you have all that right in front of you. And you can't give it to the people. It's a human rights crisis. And it's very frustrating."

-ABC News' Matt Rivers

National Security Council spokesperson John Kirby avoided saying if the U.S. believed Israel's calls for civilians in Gaza to evacuate in the next 24 hours was possible but acknowledge that it was a "tall order" given how densely populated the area is.

"Well, I think we're going to be careful not to get into armchair quarterbacking the tactics on the ground by the IDF. What I can tell you is we understand what they're trying to do. They're trying to move civilians out of harm's way and giving them fair warning. Now, it's a tall order. It's a million people, and it's a very urban, dense environment, already a combat zone. I don't think anybody's underestimating the challenge here of affecting that evacuation," Kirby said in an interview on CNN Friday morning.

"But it's pretty clear that what they're trying to do is to the maximum extent possible avoid civilian casualties and also separate Hamas from the human shields. I mean, Hamas actually gave a counterorder telling Palestinians in Gaza to stay at home. Why? Because having human shields, they think, protects them," Kirby continued.

Asked about their efforts to secure a safe passage for civilians out of Gaza, Kirby reiterated that the U.S. is talking to Israel and Egypt but would not comment further on progress.

On the Rafah crossing specifically, Kirby said "So far it's still closed. But that doesn't mean were not going to still try as hard as we can to talk to the Israelis and Egyptians about getting it open and having some sort of safe passage out. It's important that we also continue to work to make sure that humanitarian assistance can get in. The United States has no intention of stopping our efforts to continue to deliver humanitarian assistance, but there has to be a path in, there has to be a path out."

Kirby had no update on the Americans who are believed to be held hostage in Gaza and could not confirm reports that 13 hostages have been killed by Israeli airstrikes, as Hamas has claimed.

-ABC News' Molly Nagle