President Joe Biden spoke with Egyptian President Abdel Fattah El-Sisi on Friday, according to a statement from the White House.

The two leaders discussed the ongoing war and the efforts being made "to secure the release of all remaining hostages held by Hamas," according to the release.

The White House said Biden and El-Sisi spoke about a "prolonged humanitarian pause" in fighting and intensifying efforts to further increase "life-saving humanitarian assistance into and throughout Gaza."

Biden thanked El-Sisi and they agreed to continue their close coordination to increase humanitarian assistance to Gaza while setting conditions for sustainable peace in the Middle East, including the "establishment of a Palestinian state and equal measures of dignity and security for Palestinians and Israelis alike," the White House said.

Hamas has released a video of three women who are still being held in captivity in Gaza.

Shown in the video are 19-year-old Karina Ariev, 19-year-old Daniel Gilboa and 30-year-old Doron Steinbrecher, according to the Hostage Families Forum.

Ariev and Gilboa were kidnapped from the Nahal Oz kibbutz and Steinbrecher was kidnapped from the Kfar Aza kibbutz.

According to a SITE Intelligence Group translation, Ariev, addressing Israeli government officials, said in the video, "In my name and the names of all the hostages and soldiers, I ask that you get us home, stop this war, and reach an agreement. Bring us back alive. Do everything you can to get us home before we are added to the list of dead hostages. Get me home before I become a corpse."

The U.S. is expecting a "complete and thorough and transparent investigation" following allegations that 12 employees of the United Nations Relief and Works Agency for Palestine Refugees in the Near East were involved in the Oct. 7 attack on Israel, National Security Council spokesperson John Kirby said Friday.

The State Department is temporarily pausing new funding for the UNRWA in the wake of the allegations.

The Commissioner-General of UNRWA, Philippe Lazzarini, said he’s fired several staff members after Israel provided the agency "with information about the alleged involvement of several UNRWA employees" in the Oct. 7 attacks.

An investigation is underway, Lazzarini said, warning that "any UNRWA employee who was involved in acts of terror will be held accountable, including through criminal prosecution."

Earlier this month, Kirby said the UNRWA couldn't be held responsible for "the depredations of Hamas" when asked about the organization having a presence in hospitals alleged to have been used as stockpiles for weapons.

On Friday, when asked about those previous comments, Kirby noted that while there was certainly cause for concern about these allegations, "that does not and nor should it impugn the entire agency and the entire all the body of work that they're doing. ... They [UNRWA workers] have helped save literally thousands of lives in Gaza."

-ABC News’ Molly Nagle

President Joe Biden spoke with Amir Sheikh Tamim Bin Hamad Al-Thani of Qatar to discuss the latest developments in Israel and Gaza, including efforts to secure the release of all hostages taken by Hamas, according to the White House.

-ABC News’ Molly Nagle

The Israel Defense Forces said Tuesday that 21 of its reservists were killed "during operational activity" in the central Gaza Strip a day earlier.

An "RPG missile was apparently fired by terrorists" at an Israeli tank that was securing an area near the Gaza-Israel border where Israeli troops were rigging buildings with explosives for demolition, according to IDF spokesperson Rear Adm. Daniel Hagari.

"At the same time, an explosion occurred in two two-storey buildings, which collapsed as a result, while most of the force was inside and near them," Hagari said in a statement Tuesday. "The buildings apparently exploded as a result of mines that our forces planted in them and were about to explode the buildings, the terrorist infrastructure in the area."

The IDF is "investigating the details of the incident and the cause of the explosion," according to Hagari.

"War has a very painful and heavy price," he added. "The dedicated reservists, who stood up for the flag, sacrificed the most precious of all, for the security of the State of Israel and so that we can all live here safely."

Three more Israeli soldiers were killed in a separate incident in the southern Gaza city of Khan Younis on Monday, bringing the toll to 24, according to the IDF. It was the deadliest day for the Israeli military since the war with Hamas began on Oct. 7.

Israeli Prime Minister Benjamin Netanyahu called it "one of the hardest days since the war broke out."

"We must learn the necessary lessons and do everything to safeguard the lives of our fighters." Netanyahu said in a statement Tuesday. "On behalf of our heroes, for our very lives, we will not stop fighting until total victory."

"Our hearts are with the dear families in their most difficult time," Israeli Defense Minister Yoav Gallant said.

He added, "This is a war that will determine the future of Israel for decades to come -- the fall of the fighters is a requirement to achieve the goals of the war."

A total of 221 Israeli troops have been killed in Gaza since the ground operation began late last year, according to the IDF.

-ABC News’ Yael Benaya, Jordana Miller, Dana Savir, Joe Simonetti and Morgan Winsor