CAIRO (AP) — 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.