The Israeli Prime Minister's Office released a statement on Sunday's talks between CIA Director Bill Burns, the prime minister of Qatar and intelligence officials from Israel and Egypt.

The meeting was "constructive" but "significant gaps" remain, the statement said, adding that more meetings are expected this coming week.

-ABC News' Jordana Miller

The secretary-general of the United Nations appealed on Sunday for continuing funding for the U.N. aid agency responsible for Gaza.

Nine countries, including the United States, paused their funding for the United Nations Relief and Works Agency for Palestine Refugees after Israel accused 12 of its employees of being involved in the Oct. 7 Hamas attack.

Mark Regev, an Israeli spokesman, told ABC News in a phone interview Sunday that Israel gathered intelligence about the alleged connection to terrorism through videos released by Hamas and others during the Oct. 7 attack and claimed there's "clear unrefutable evidence that U.N. paid staff were involved in crimes against humanity."

About 2 million people in Gaza depend on the agency for daily survival, Secretary-General António Guterres said in a statement Sunday.

According to Guterres, "Of the 12 people implicated, nine were immediately identified and terminated by the Commissioner-General of UNRWA, Philippe Lazzarini; one is confirmed dead, and the identity of the two others is being clarified."

"The abhorrent alleged acts of these staff members must have consequences," he said in the statement.

He added, "But the tens of thousands of men and women who work for UNRWA, many in some of the most dangerous situations for humanitarian workers, should not be penalized. The dire needs of the desperate populations they serve must be met."

-ABC News' Matt Gutman, Edward Szekeres and Kevin Shalvey

The number of nations pausing funding to the United Nations Relief and Works Agency for Palestine Refugees in the Near East has risen to 9 -- an unprecedented number for a UN agency. This withdrawal of funding comes amid allegations from Israeli officials that some of the agency's staff were involved in the Oct. 7 Hamas attacks.

On Saturday, Britain, Germany, Italy, the Netherlands, Switzerland and Finland joined the U.S., Australia and Canada in pausing funding to UNRWA.

"UNRWA lifesaving assistance is about to end following countries decisions to cut their funding to the Agency. Our humanitarian operation, on which 2 million people depend as a lifeline in Gaza, is collapsing. I am shocked such decisions are taken based on alleged behavior of a few individuals and as the war continues, needs are deepening & famine looms," the commissioner general of UNRWA said in a statement.

"Palestinians in Gaza did not need this additional collective punishment. This stains all of us," the statement said.

-ABC News' Matt Gutman, Dana Savir, Guy Davies

A ruling on Friday from the International Court of Justice stopped short of ordering a ceasefire but ordered Israel to prevent acts of genocide against Palestinians and do more to help civilians.

In response to the ruling, Prime Minister Benjamin Netanyahu said that the war aimed at eliminating Hamas would continue.

-ABC News' Edward Szekeres

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