CAIRO >> The United Nations suspended food distribution in the southern Gaza city of Rafah on Tuesday due to a lack of supplies and an untenable security situation caused by Israel’s expanding military operation. The U.N. warned that humanitarian operations across the territory were nearing collapse.

A senior United States official said Israel has addressed many of the Biden administration’s concerns about a full-scale ground invasion of Rafah aimed at rooting out Hamas fighters there. U.S. President Joe Biden had previously opposed a total military assault on a city filled with displaced civilians if plans did not prioritize the safety of innocent Palestinians. The U.S. official spoke on condition of anonymity because they were not authorized to comment publicly.

The official said the administration stopped short of greenlighting the Israeli invasion plan, but said Israeli officials’ changes to the planning suggested they were taking the American administration’s concerns seriously.

Over the past two weeks, hundreds of thousands of people have fled Rafah in a chaotic exodus, seeking shelter in new tent camps or crowding into areas already devastated by previous Israeli offensives. Some 400,000 people are believed to still be in Rafah after around 900,000 rushed to escape, according to COGAT, the Israeli military office in charge of Palestinian civilian affairs.

Getting aid to displaced civilians has been hampered by closed and chaotic land crossings, as well as problems plaguing the U.S. military’s new floating pier meant to provide an alternative sea route for aid into Gaza. Over the weekend, hungry Palestinians took aid from a U.N. vehicle convoy coming from the pier, and the U.N. said since then it had been unable to receive trucks there.

Pentagon press secretary Maj. Gen. Pat Ryder told reporters in Washington that for the past few days, forward movement of aid from the pier was paused but it resumed Tuesday. There was no confirmation from the U.N.

The U.N.’s World Food Program said it was running out of food for central Gaza, where hundreds of thousands of people are now living.

“Humanitarian operations in Gaza are near collapse,” said Abeer Etefa, a WFP spokesperson. If food and other supplies don’t resume entering Gaza “in massive quantities, famine-like conditions will spread,” she said.

The warning came as Israel seeks to contain the international fallout from a request at the world’s top war crimes court for arrest warrants targeting both Israeli and Hamas leaders. The move garnered support from three European countries, including Israel’s key ally France.