President Joe Biden confirmed that he has pressed Israeli Prime Minister Benjamin Netanyahu for a three-day pause in Gaza. Biden said he's also asked for an even bigger window to get the remaining hostages out.

Biden told reporters his message to the families of hostages is: "We're not going to stop until we get them out."

Israeli officials say Hamas had 239 hostages in Gaza. Four hostages were released from Gaza over the last few weeks: two American women and two Israeli women. The Israel Defense Forces said a fifth hostage, a female Israeli soldier, was rescued during the Israeli military's ground operations in Gaza.

Asked if there would be a cease-fire, Biden responded, "None. No possibility."

-ABC News' Justin Ryan Gomez and Tia Humphries

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

A mother of four in Gaza told ABC News she is worried about getting vaccinations for her days-old newborn and keeping her children warm and fed.

"I'm afraid for him because there is no warmth, no vaccinations, and no good health supplies," Maha al Sharbsy, 32, said of her fourth child, Mohammed, who was born on Saturday. "The child has started to show signs of jaundice, and his condition is unstable."

Al Sharbsy said she and her children evacuated northern Gaza days after the war started following "intense" bombings. Now in southern Gaza, she said her children cannot sleep "because there are no winter clothes and no food," and she doesn't have money to buy food.

"I want the children to live in peace, cleanliness, and good health conditions. At the very least, for the sake of the children," she said. "We, the adults, are not the issue; the children are what matter."

Her 9-year-old son, Riad, told ABC News he misses his room and toys and is worried for his family.

"I'm afraid of the rockets, I'm afraid of people getting injured and dying, and I'm afraid of planes bombing our homes," he said.

-ABC News' Sami Zayara and Zoe Magee