By Josh Levs
U.S. Secretary of State John Kerry calls it proof "beyond any reasonable doubt." Defense Secretary Chuck Hagel says it's "very clear."
President Barack Obama says the United States has "high confidence" that Syria used chemical weapons - the strongest position the U.S. can take short of confirmation.
Britain, France, and Germany say their intelligence backs up the same conclusion.
But Russia has rejected those claims, insisting there's no such proof. Russian President Vladimir Putin said he wants to see evidence that would make the determination "obvious."FULL STORY