The U.S. does not know where the last unaccounted for American woman is or what her condition is, according to National Security Council spokesperson John Kirby.

Since the cease-fire began several days ago, only one American woman and one American child have been released by Hamas.

Asked by ABC News if the U.S. believes Hamas does not know where all the hostages are -- or if they're propagating that information as a delay tactic -- Kirby said even though some other groups also took hostages, "That’s not to say that Hamas doesn’t have visibility on that, or doesn’t have a way to find out about it."

Kirby said Israel has made clear that "when these pauses are over, they intend to go back at it."

"And as they make that decision, they’ll continue to find support from the U.S. in terms of tools and capabilities, the weapons systems they need, as well as the advice and the perspectives that we can offer in terms of urban warfare," Kirby said.

He added that he believes the U.S. approach has had a "practical effect" on the way Israel is conducting its operations. Kirby said the U.S. shared experiences with urban warfare in places like Fallujah and Mosul in Iraq, and that the Israelis were "receptive" to those lessons learned.

-ABC News' Selina Wang

Thursday morning's shooting carried out by Hamas at a Jerusalem bus stop did not violate the cease-fire agreement because "this attack happened in Jerusalem" and "the pause is in the fighting more specific to Gaza," National Security Council spokesperson John Kirby said.

"It didn't technically violate the deal that was in place, but obviously it's a stark reminder of who they’re facing and what kind of enemy they’re opposing," Kirby continued.

"If anybody's guessing and wondering whether Hamas still has murderous intentions against the Israeli people, just look at what happened in Jerusalem," Kirby said.

At least three people were killed in Thursday's shooting. The two gunmen were killed by two off-duty Israeli soldiers and a civilian who were near the scene, according to Israeli police.

Hamas claimed responsibility, saying the shooting was in response to Israel's "unprecedented crimes" including "brutal massacres" in Gaza and the killing of children in the occupied West Bank.

-ABC News' Fritz Farrow

About 80% of Gaza’s population is now homeless, with many people forced to live in make-shift shelters, largely exposed to the elements, according to the United Nations.

The bad weather is compounding an already difficult situation, several Gaza residents told ABC News in interviews conducted during the last two weeks. People living in tents are struggling to make them watertight. They are patching them up as best they can with tarpaulin. The rainy season in Gaza usually begins in late November or early December and temperatures can get as low as 50 degrees Fahrenheit.

"At 6 in the morning, we woke up to rain falling and the place was soaked with water," Iqbal Saleh Mohsen Abu Al-Saud, one resident, told ABC News, when the winter rains first came to Gaza last week.

"We are 30 people in this tent,“ he explained. "We were displaced from Gaza City from the Sheikh Radwan neighborhood. We went from home to schools, then to tents, from place to place. Without food or shelter, we only left our homes because of the bombing."

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Two Israeli hostages released in the Gaza Strip -- 21-year-old Mia Schem and 40-year-old Amit Sosna -- have been transferred to the Red Cross and are now on their way to Israel, the Israel Defense Forces said Thursday evening.

More hostages are expected to be released in the coming hours, according to the IDF.

Yifat Zailer, a relative of one of the youngest Israeli hostages still being held in the Gaza Strip, said Tuesday that she has yet to hear whether her missing family members will be among those released by Hamas as part of the truce.

"The pain of not having them back yet is incredible. Tomorrow is the last day of this deal of cease-fire and we are very concerned," Zailer told ABC News' George Stephanopoulos in an interview on "Good Morning America."

Zailer said there has been no word from Israeli officials or others on whether her loved ones will be included in the prisoner swap with Hamas. The last thing she heard about her missing relatives was in a recent statement released by the Israel Defense Forces that stated there was a possibility of another Palestinian militant group holding them hostage.

"We are completely at loss," she said. "We don't know about their condition, we don't know if they're still alive even and it’s unbearable. They promised in this deal they signed, all the sides, that all mothers and children are supposed to be released."

"Prisoners are being released," she noted. "Where's my family?"

Four of Zailer's relatives -- her 32-year-old cousin Shiri Babas, Shiri's 34-year-old husband Yarden and the couple's children, 4-year-old Ariel and 10-month-old Kfir -- were kidnapped from their kibbutz in southern Israel during Hamas' attack on Oct. 7 and taken hostage to Gaza. Zailer said she doesn't understand why they -- especially the baby -- are still being held hostage and wondered whether it was for "leverage."

"Kfir is going to be 11 months [old] soon. He was kidnapped when he was 9 [months old]. We don't know how he's being fed," she told ABC News. "Why aren't they on any list? Every night we receive that phone call that they're not coming back tomorrow is torture -- it's psychological torture."

When asked whether she would support a deal for Israel to release all of its Palestinian prisoners in exchange for the hostages in Gaza, Zailer said: "That's a really hard question, but I must say I am."

"All those hostages are fathers, mothers, injured people and, of course, my family members as well among them," she continued. "So there's no price for our loved ones."

Zailer said she wants the world to know that her captive relatives "are and always were people of peace" and "innocent civilians."

"My uncle raised his daughter to love who's different from her," she added. "She's an incredible mother, her husband is an incredible father."

-ABC News' Morgan Winsor