The number of children who are missing or separated from their families in Gaza may be as many as 21,000, according to humanitarian aid group Save the Children.

This organization -- which has been providing support for Palestinian children in the region since 1953 -- reports that likely 17,000 children are unaccompanied and separated, and another 4,000 children are likely buried under the rubble based on data from the United Nations and the Hamas-run Ministry of Health in Gaza.

"Children who are missing but living are vulnerable, face grave protection risks and must be found. They must be protected and reunited with their families," said Save the Children’s Regional Director for the Middle East Jeremy Stoner. "For the children who have been killed, their deaths must be formally marked, their families informed, burial rites respected, and accountability sought."

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-ABC News’ Kiara Alfonseca

State Department spokesperson Matt Miller said Secretary of State Antony Blinken is emphasizing several points in his ongoing meeting with Israeli Defense Minister Yoav Gallant on Monday afternoon.

"No. 1, our ongoing commitment to Israel's security," Miller said. "No. 2, the importance of Israel developing robust, realistic plans for the day after the conflict, plans that include a path towards governance, towards security, towards reconstruction."

"He's going to emphasize the need to avoid further escalation of the conflict, and then he will, as always, emphasize the need to improve humanitarian access [in Gaza], where we have seen somewhat of a slowdown in access in the south," Miller continued, adding that Blinken hoped to hear "concrete commitments from [Gallant] to work on that problem."

-ABC News’ Shannon Crawford

Following Israeli Prime Minister Benjamin Netanyahu’s comments alleging a U.S. slowdown in military aid to Israel, the Pentagon continues to say that only the one shipment of 2,000-pound bombs has been suspended.

"Again, just to clarify, we have paused one shipment to Israel," Pentagon spokesman Maj. Gen. Pat Ryder told reporters on Monday.

"Everything else continues to flow on schedule as normal. It is not diminished," he said.

Israeli Defense Minister Yoav Gallant, who is in Washington, D.C., for meetings with U.S. officials, will meet with Defense Secretary Lloyd Austin at the Pentagon on Tuesday, Ryder said.

-ABC News’ Luis Martinez

The Israeli military said it is winding down the intensity of fighting in the Rafah area of Gaza.

"We are clearly approaching the point where we can say we have dismantled [Hamas’] Rafah Brigade, that it is defeated not in the sense that there are no more terrorists, but in the sense that it can no longer function as a fighting unit," the IDF chief of the general staff, Lt. Gen. Herzi Halevi, said Sunday night. "It has suffered many casualties, and you will ensure until the completion of the mission here, to eliminate as many terrorists and destroy as much terrorist infrastructure as possible going forward."

-ABC News’ Will Gretsky

State Department spokesperson Matthew Miller on Tuesday addressed concerns that the United Nations could suspend humanitarian operations in Gaza as the conditions its workers face in the enclave have devolved from bad to worse.

"I can tell you this is an issue we have been intensely focused on," Miller said, adding that the State Department’s special envoy for Middle Eastern humanitarian issues has coordinated with the U.N. and Israeli entities to "try to figure out a way to allow U.N. workers to safely do their jobs."

Miller noted while some aid was flowing into Gaza through various points of entry and moving through the north, the U.S. had observed "over the past few weeks, a big backlog" at Kerem Shalom -- the border between Israel and southern Gaza -- due to a "breakdown in security on the ground." This was caused not by the Israel Defense Forces or Hamas, but by "random looting, and criminal gangs and criminal actors who are attacking trucks," Miller said.

Miller said U.N. aid workers will be provided with "personal protective equipment, radios and other communication devices so they can communicate with each other and safely move around Gaza."

Miller said, "Long term, we want to see a cease-fire and the reestablishment of Palestinian-led governance. And ultimately, we have ideas for providing security inside Gaza, providing governance and reconstruction -- all of these things that would go to a restoration of law and order. ... But that is a long term that in no way accounts for the here and now."

Miller also argued that the U.S. had a limited role it could play in increasing security for aid workers at this stage, saying it was ultimately an issue that Israel and the U.N. would have to address.

-ABC News’ Shannon Crawford