AMMAN, Jordan — Israel, having banned the United Nations aid agency for Palestinian refugees from sending aid and staff to Gaza, is now taking unprecedented steps to de-register major nongovernmental aid groups for ideological reasons, according to several officials of humanitarian organizations.

They say the new rules threaten the ability of some of the biggest international nongovernmental organizations — known as INGOs — to send in aid or staff to both Gaza and the Israeli-occupied West Bank.

"INGOs are in limbo — most who have submitted have either been not accepted or rejected," an official with an aid organization that is aware of the situation said of the application process required for nongovernmental aid organizations operating in Gaza and the West Bank. The official spoke on

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