By Michelle Nichols

UNITED NATIONS (Reuters) -United Nations aid chief Tom Fletcher has demanded that Israel provide evidence for its accusationsthat staff with the U.N. Office for the Coordination of Humanitarian Affairs were affiliated with Palestinian militants Hamas, accordingto a letter seen by Reuters on Friday.

At a U.N. Security Council meeting on Wednesday, Israel's U.N. Ambassador Danny Danon declared that Fletcher and OCHA were no longer neutral and that hundreds of OCHA employees would undergo security vetting. Israel would also restrict OCHA visas to one month,........

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