Technically, none...although one could argue that Newsweek should not have taken this to be confirmation of the event:
Whitaker wrote that the magazine’s information came from “a knowledgeable U.S. government source,” and writers Michael Isikoff and John Barry had sought comment from two Defense Department officials. One declined to respond, and the other challenged another part of the story but did not dispute the Quran charge, Whitaker said.
IMO, they should have gotten confirmation from at least one more source.
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