Hamas' military wing al-Qassam Brigades alleged Wednesday that three hostages have died as a result of the Israeli military's previous bombings in the Gaza Strip.

In a statement posted on a Telegram channel associated with the al-Qassam Brigades, the slain hostages were identified as Shiri Silverman Bibas, Kfir Bibas and Ariel Bibas. It was unclear when the trio had allegedly died and ABC News was unable to verify the claim.

Several members of the Bibas family, including 32-year-old Shiri, her 4-year-old son Ariel and her 10-month-old son Kfir, were kidnapped from their kibbutz in southern Israel during Hamas' attack on Oct. 7 and taken hostage to Gaza, according to relatives and Israeli authorities.

The Israel Defense Forces confirmed in a statement Wednesday that it is investigating the reports of their deaths.

"IDF representatives spoke with the Bibas family following the recent reports and are with them at this difficult time. The IDF is assessing the accuracy of the information," the IDF said. "Hamas is wholly responsible for the security of all hostages in the Gaza Strip. Hamas must be held accountable."

In a statement obtained by ABC News, the Bibas family said Wednesday that they are "updated on the latest Hamas publication."

"We are waiting for the news to be confirmed or hopefully refuted soon by military officials," the family added. "We thank the people of Israel for the warm embrace but ask to maintain our privacy at this complex time."

-ABC News' Ayat Al-Tawy, Anna Brund, Jordana Miller, Dana Savir and Morgan Winsor

Itai Pessach, director of Edmond and Lily Safra Children's Hospital at Sheba Medical Center, praised the newly released hostages who arrived at the hospital Tuesday, calling them "extraordinary women" who "endured the hardships of their captivity in a remarkable fashion."

"Some of them had complex underlying illnesses and some suffered injuries when they were abducted or during their time in captivity," Pessach said. "They will need further medical treatment and attention, but there's no immediate danger to any of them."

Twelve hostages were released on Tuesday in the most recent prisoner swap: 10 Israelis and two foreign nationals from Thailand. Nine of the Israelis were women. One was a 17-year-old girl, Maya, and her dog, Bella.

Pessach called Maya "a very brave young woman. "

"Bella also was examined last night by the veterinarian service of the Sheba Medical Center, and she's also fine, and she would stay with Maya for as long as she needs while they are still here," Pessach said.

The Israeli Prime Minister's Office confirmed that it has received the list of hostages due to be released by militants in the Gaza Strip on Wednesday.

The families of the hostages on Wednesday's list have all been notified, the Israeli Prime Minister's Office said.

The truce between Gaza's militant rulers, Hamas, and Israel is set to expire on Thursday morning, but the possibility of extending it further is reportedly under negotiation.

-ABC News' Dana Savir and Morgan Winsor

Two Palestinian children were allegedly gunned down by Israeli soldiers operating in the militant stronghold of Jenin in the Israeli-occupied West Bank on Wednesday, according to Palestinian health officials.

The Palestinian Authority, the Fatah-led governing body that oversees parts of the West Bank, identified the two victims as an 8-year-old boy and a 15-year-old boy who it said "were killed by occupation bullets in Jenin."

The Palestine Red Crescent Society confirmed that its crews had transported the younger child from Jenin's al-Basateen neighborhood before he was pronounced dead.

Surveillance footage reviewed by ABC News purportedly shows the moment both boys were shot, but the perpetrators were out of sight.

ABC News has reached out to the Israel Defense Forces for comment.

The alleged incidents occurred as the Israeli military carried out hourslong raids on the Jenin refugee camp.

Deadly violence has surged in the West Bank since Hamas, the rival Palestinian faction that governs the Gaza Strip, carried out an unprecedented attack on neighboring Israel on Oct. 7, prompting Israeli forces to retaliate.

-ABC News' Nasser Atta and Morgan Winsor

The United States will send three relief flights into Egypt on Tuesday to keep up the flow of humanitarian aid into the war-torn Gaza Strip, which has reached its highest levels as officials take advantage of the current humanitarian pause.

"The movement over the last four or five days of assistance has been so significant in volume that a backfill in El Arish [International Airport in Egypt] is now needed, and these planes are part of that backfill," a senior Biden administration official told reporters during a telephone call on Monday afternoon.

Some 800 trucks carrying aid have crossed into Gaza during the first days of the pause, officials said, which is a huge increase from the days prior. So far, a total of about 2,000 aid trucks have entered Gaza since Oct. 7, meaning that 40% of them had gone in in just the last four days.

The planes on Tuesday will be carrying medical aid urgently needed in Gaza as well as food, particularly for children, and winter clothing as the rainy season begins, according to officials.

The aid will be delivered by the United Nations to civilians.

Two more planeloads are expected to follow in the coming days, officials said. Previously, there were also five commercial flights of aid coordinated by the U.S. government, according to officials.

The officials emphasized this aid as part of U.S. President Joe Biden’s commitment to helping the Palestinian people, saying that he has made sure America is the largest single donor both to the United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA) and to Palestinian territories.

Going forward, the officials said the goals for humanitarian aid in Gaza will be expanding access, pushing for restoration of essential services, especially water, and keeping civilians out of harms way.

"The president has also consistently stressed the importance of ensuring military operations are conducted in a manner consistent with international humanitarian law, including with respect to the protection of civilians," the senior Biden administration official told reporters.

Officials did not offer any new information on the hostage negotiations between Gaza's militant rulers, Hamas, and Israel but reiterated that they hope to see Americans released in the coming days.

-ABC News' Cheyenne Haslett and Morgan Winsor