Israel-Gaza updates: 300,000 have fled Rafah, UN agency says

The Gaza Health Ministry said its medical teams have found a third mass grave inside Al-Shifa Hospital's medical complex.

The health ministry has recovered 49 bodies so far as the exhumation process continues.

The ministry said this is the seventh mass grave found by medical teams inside hospitals — one in Kamal Adwan Hospital, three in the Shifa Medical Complex and three in the Nasser Medical Complex. A total of 520 bodies have been recovered from the graves.

In April, the Israel Defense Forces denied accusations from the ministry that they buried at least 283 bodies in a mass grave near Nasser Hospital in Gaza. The IDF alleged that during its operation near the area of Nasser Hospital, it examined corpses in that area in an effort to locate hostages.

The U.S. has paused a munitions shipment to Israel, U.S. Secretary of Defense Lloyd Austin confirmed Wednesday, warning that a major Israeli operation in Rafah could change the U.S. calculus on security assistance.

Austin is the first senior administration official to publicly confirm the U.S. pause on military aid but added that no "final determination" has been made.

"We are currently reviewing some near-term security assistance shipments in the context of unfolding events in Rafah," Austin told a Senate subcommittee, emphasizing that supplemental funding the administration just passed is not in jeopardy.

"We've been very clear, senator, as you know, from the very beginning that Israel shouldn't launch a major attack on Rafah without accounting for and protecting those civilians that are hitting that battlespace. And, again as we have assessed the situation, we paused one shipment of high payload munitions."

Austin maintained that the U.S.-Israel alliance is "ironclad."

-ABC News' Chris Boccia

One of the three hospitals in Rafah, Al-Najjar, is no longer functioning due to the ongoing hostilities in its vicinity and Israel's military operation, according to the World Health Organization.

"Hospitals in the south of Gaza only have three days of fuel left, which means services may soon come to a halt," the WHO warned.

The closure of the border crossing continues to prevent the entry of fuel needed for aid operations; without fuel all humanitarian operations will stop, the WHO warned. Border closures are also impeding delivery of humanitarian aid into Gaza, the WHO said.

"At a time when fragile humanitarian operations urgently require expansion, the Rafah military operation is further limiting our ability to reach thousands of people who have been living in dire conditions without adequate food, sanitation, health services and security. This must stop now," the WHO said.

-ABC News' Will Gretsky

Israel said it has reopened the Kerem Shalom Crossing Wednesday for the entry of humanitarian aid into the Gaza Strip.

"Trucks from Egypt carrying humanitarian aid, including food, water, shelter equipment, medicine, and medical equipment donated by the international community are already arriving at the crossing. After a thorough security inspection by the security personnel of the Ministry of Defense Crossing Authority, the equipment will be transferred to the Gazan side of the crossing," Israel said in a statement.

Israel had closed the crossing after it said Hamas fired a rocket toward the area over the weekend, killing four Israeli soldiers.

-ABC News' Will Gretsky