World Health Organization officials visited the hospital in Gaza on Saturday.
Thousands of people have died and thousands more have been injured since the militant group Hamas launched an unprecedented surprise attack on Israel on Oct. 7 and Israel retaliated with a bombing campaign and total siege of the neighboring Gaza Strip, leaving the region on the verge of all-out war.
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The latest outbreak of war between Israel and Hamas, the Palestinian militant group that governs the Gaza Strip, has passed the four-month mark.
In the Gaza Strip, at least 30,228 people have been killed and 71,377 others have been wounded by Israeli forces since Oct. 7, according to Gaza's Hamas-controlled Ministry of Health.
In Israel, at least 1,200 people have been killed and 6,900 others have been injured by Hamas and other Palestinian militants since Oct. 7, according to the Israel Defense Forces.
There has also been a surge in violence in the Israeli-occupied West Bank. Israeli forces have killed at least 395 people in the territory since Oct. 7, according to the Palestinian Ministry of Health.
The ongoing war began after Hamas-led militants launched an unprecedented incursion into southern Israel from neighboring Gaza via land, sea and air. Scores of people were killed while more than 200 others were taken hostage, according to Israeli authorities. The Israeli military subsequently launched retaliatory airstrikes followed by a ground invasion of Gaza, a 140-square-mile territory where more than 2 million Palestinians have lived under a blockade imposed by Israel and supported by Egypt since Hamas came to power in 2007. Gaza, unlike Israel, has no air raid sirens or bomb shelters.
A senior Israeli political source said Tuesday that progress has been made on a hostage deal and a breakthrough could come in the next 48-72 hours.
The Israeli War Cabinet is meeting Tuesday night to discuss the deal, the source said.
Israeli officials have said as many as 239 Israelis are being held captive by Hamas in Gaza.
-ABC News' Jordana Miller
The U.S. has intelligence that shows Hamas has used hospitals in Gaza to support its military operations and hold hostages, National Security Council spokesperson John Kirby confirmed Tuesday.
"I can confirm for you that we have information that Hamas, and the Palestinian Islamic Jihad, used some hospitals in the Gaza Strip -- including Al-Shifa -- and tunnels underneath them to conceal and to support their military operations and to hold hostages," Kirby said during a gaggle on Air Force One.
Kirby said Hamas and the Palestinian Islamic Jihad operate a command and control node from Al-Shifa Hospital in Gaza City where "they have stored weapons there, and they're prepared to respond to an Israeli military operation against that facility."
Kirby said the information comes from a "variety" of intelligence sourcing.
He cautioned again that these actions by Hamas "do not lessen Israel's responsibilities to protect civilians in Gaza."
"This is something that we obviously are going to continue to have an active conversation with our counterparts about," he said.
During a Pentagon briefing Tuesday, deputy Pentagon press secretary Sabrina Singh described the information as an independent U.S. intelligence assessment and "newly downgraded information that we felt was important to get out today because there have been a lot of questions about the hospital and how Hamas operates."
Singh did not go into specifics on the intel but said "we feel very confident in our sourcing and what the intelligence community has gathered on this topic."
-ABC News' Justin Gomez and Luis Martinez
A fuel shortage has stalled aid deliveries from Egypt into the Gaza Strip, a Rafah border crossing official told ABC News on Tuesday.
"No aid got in today because [the United Nations Relief and Works Agency for Palestine Refugees] trucks have no fuel," Wael Abu Omar, the Palestinian spokesman for the Rafah border crossing, said.
The UNRWA, which is responsible for receiving and distributing humanitarian aid coming from Egypt in Gaza, said Monday its trucks ran out of fuel and it would not be able to to receive aid coming through Rafah on Tuesday.
Tuesday marks the first day no aid trucks crossed into Gaza through Egypt since Oct. 21 amid the war.
Earlier on Tuesday, the Palestine Red Crescent Society said it received the last convoy of trucks from Egypt on Monday, including 155 trucks, following the UNRWA's announcement.
-ABC News' Ayat Al-Tawy
A mass grave has been dug inside Al-Shifa Hospital in Gaza to bury dozens of corpses after Israeli forces banned the Red Cross from collecting the bodies, according to Dr. Munir Al-Bursh, the director general of the Palestinian Health Ministry.
"There are approximately 100 corpses lying on the hospital courtyard that have rotted and decomposed," Al-Bursh told Al-Hadath TV on Tuesday, speaking from inside the hospital, the largest in Gaza. "We are walking on worms and we fear there will be an epidemic."
Medical staff and people sheltering inside the medical complex have dug a "large hole" to bury the dead bodies, he said. Dozens of other bodies stored in refrigerators at the facility will also be buried in the mass grave, he said.
"Israel tanks are at the gates of the hospital and we are burying bodies under gunfire and with tanks around," Al-Bursh said.
The hospital ceased to function on Saturday after it ran out of fuel, and staff and health ministry officials inside say the facility has been under siege by Israeli forces for five days, with drones and snipers firing into it.
"We are trying to dig a mass grave to bury the martyrs inside Al-Shifa Hospital. Our efforts to remove the bodies of the martyrs from Al-Shifa complex have failed," said Dr. Youssef Abu Al-Rish, undersecretary of the Hamas-run Gaza Ministry of Health.
Israeli officials have said Hamas is operating a command center from under the hospital, something denied by Hamas.
-ABC News' Ayat Al-Tawy and Morgan Winsor
