Jordan and the United Arab Emirates were expected to begin airdrops in the coming days, but experts warned that the bulk of necessary aid could come only by land.

Israel will coordinate airdrops of aid into Gaza from foreign countries in the coming days, an Israeli security official confirmed to ABC News.

Health authorities say Israeli strikes in Gaza killed at least 21 people. More than half of those killed late Tuesday and early Wednesday reportedly were women and children.

Plus: Hundreds of people have been killed in recent weeks trying to reach food, mostly in mass shootings by Israeli soldiers.

A joint statement called for an immediate ceasefire and said that "withholding essential humanitarian assistance to the civilian population is unacceptable."

An internal U.S. government analysis found no evidence of systematic theft by the Palestinian militant group Hamas of U.S.-funded humanitarian supplies, challenging the main rationale that Israel and the U.

Some of Israel’s closest allies have stepped up criticism of its restrictions on aid to Gaza, where doctors and aid organizations say people are dying of starvation.