"We have made some progress...but more needs to be made," Austin told reporters in Florida.
Last month, Austin and US Secretary of State Antony Blinken sent a letter to their Israeli counterparts to improve the humanitarian situation in Gaza within 30 days or risk an American arms embargo.
"I won't comment specifically on this correspondence -- me, Secretary Blinken and our counterparts -- which was not designed to be public correspondence," Austin said.
Israel has continued a devastating offensive on Gaza since a cross-border attack by the Palestinian group Hamas on Oct. 7, 2023, killing nearly 43,500 people and rendering the enclave almost uninhabitable.
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