CIA Director William Burns took part in a meeting in Qatar regarding a potential hostage deal, a U.S. official confirmed.

Burns also traveled to Egypt "where he met with his intelligence counterparts and country leaders," the official said. "They discussed issues of mutual concern, including the situation in Gaza and the USA commitment to ensuring humanitarian aid there."

A "general" cease-fire would benefit Hamas and "legitimize" the group's Oct. 7 surprise attack on Israel, U.S. National Security Council spokesperson John Kirby said Thursday.

"A general cease-fire means everybody lays your arms down and you talk about the end of this conflict," Kirby told ABC News' George Stephanopoulos on "Good Morning America." "To do that right now would be a benefit to hamas. It would give them time. It would also legitimatize what they did on October 7th."

He said Israeli military forces were in the middle of an "operational campaign" targeting Hamas leadership.

"We believe Israel has a right to do that and we'll continue to make sure they get the tools and capabilities," Kirby said.

But there may be a need for a "pause" if some of the about 240 hostages taken by Hamas are to be released, Kirby said

"What we want to make sure is not only can we secure their release, George, but that when we get that release secured, that we can get them safely out of Gaza and into Israel, into safer hands," he said. "That requires this idea of a temporary humanitarian pause."

-ABC News' Kevin Shalvey

About 72,000 people have fled northern Gaza in the last four days, moving south along a corridor opened by Israeli military forces, the United Nations said Thursday.

About 50,000 traveled along Salah al-Din Road in the hours the corridor was opened on Wednesday, the U.N. Office for the Coordination of Humanitarian Affairs said.

“Clashes and shelling on and around the road reportedly continued, endangering evacuees with reports of corpses alongside the road,” the U.N. statement said.

Many have arrived at the corridor on foot. Some who’ve driven there have been told to leave their vehicles along the outskirts of Gaza City, the U.N. said. Videos and photos released by the Israel Defense Forces have shown crowds marching while waving white flags.

“The evacuees then walk 4-5 kilometres down the corridor, with an estimated distance of up to 20 kilometres for those traveling farthest,” the U.N. said.

-ABC News’ Victoria Beaule

Israel is considering a proposal presented by Egypt and Qatar for a humanitarian pause in exchange for the release of hostages, sources tell ABC News.

The U.S. is in close coordination with all parties negotiating this possible deal, the sources said and no final deal has been reached yet.

No further details were available.

The Israeli military on Monday accused Hamas militants of building "a whole tunnel system under" Sheikh Hamad Hospital in Gaza.

The practice of using hospitals as civilian shields has been "absolutely normal" for the militants, IDF spokesperson Jonathan Conricus said.

"Why it is this important? Because hospitals and other humanitarian facilities are supposed to enjoy special protections," Conricus said in a morning briefing. "But what Hamas is doing is that they've violating that special protection and using it for combat purposes."

More than 500 people have died in at least 102 strikes near or on health care facilities since Oct. 7, the World Health Organization said on Sunday.

"Over half of health attacks and over a half of hospitals damaged were in Gaza City," WHO officials said on social media. "Health care is #NotATarget."

During Monday's briefing, Conricus shared an IDF video that he said demonstrated there were Hamas tunnels under the hospital. He also shared several photos that he said dated back to at least 2010, when the hospital was being constructed. The groundwork for the Hamas tunnels was put in place at that time, he said. ABC News was not immediately able to verify the claims.

In a photo said to be from 2023, rocket-launching sites could be seen along the outskirts of the facility, Conricus said. He presented another photo of what he said was the opening of a Hamas tunnel on the grounds.

"We know that underneath this entire complex, there's an entire Hamas infrastructure underground," Conricus said. "And it is absolutely normal. This is how Hamas operates all around the Gaza Strip."

-ABC News' Kevin Shalvey