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WASHINGTON — The White House said on Thursday that American intelligence agencies now believed, with “varying degrees of confidence,” that the Syrian government had used chemical weapons, but it said it needed conclusive proof before President Obama would take action.

The disclosure, in letters to Congressional leaders, takes the administration a step closer to acknowledging that President Bashar al-Assad has crossed a red line established by Mr. Obama last summer, when he said the United States would take unspecified action against Syria if there was evidence that chemical weapons had been used in the civil war.

http://www.nytimes.com/2013/04/26/world/...times&_r=0