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“I don’t think anybody knows what they are,” he said during a break in meetings at NATO headquarters in Brussels. “I’m sure you’ve heard the old saying, ‘Don’t always believe what you read in the newspapers.’”

Regarding the Israeli claim, Mr. Kerry said he spoke with Israeli Prime Minister Benjamin Netanyahu on Tuesday morning and that “I think it’s fair for me to say that he was not in a position to confirm” the remarks made by Gen. Brun.

In Washington, White House spokesman Jay Carney told reporters the administration is supports an ongoing “United Nations unified investigation” into whether chemical weapons have been used in Syria.

U.S. authorities are also “engaging in other methods of monitoring the possible use or transmission” of such weapons, he said, but added that he could not “get into great detail on those intelligence related matters.”

“We coordinate closely with our partners, including the French, British and the Israelis,” Mr. Carney saidU