USA geht von Chemiewaffeneinsatz in Syrien aus [Update]

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.

[...]

Although the White House said it could not confirm the circumstances in which victims were exposed to chemical weapons, it said it believed that the chemical agent sarin had been used. “We do believe,” the letter said, “that any use of chemical weapons in Syria would very likely have originated with the Assad regime.”

New York Times -  U.S. Says It Suspects Assad Used Chemical Weapons

siehe: Chemiewaffeneinsatz in Syrien

Update: 

Arms Control Wonk - Syria and Sarin