Legislation that goes into effect on Thursday bars UNRWA from operating in the country. That will affect aid delivery to Gaza and beyond.

The directive came in a letter to the U.N., after the Israeli Parliament banned the relief agency that has aided Palestinian refugees for decades.

Hundreds of truckloads of food, fuel and other supplies have arrived in Gaza each day since the cease-fire took effect. But the need is vast after 15 months of war.

While Israel asserts that the United Nations has tried to minimize the problem, the global organization says Israeli officials are waging an unfair campaign to discredit it.

© Sergey Ponomarev for The New York Times