"We assess with high confidence that the Syrian government carried out the chemical weapons attack against opposition elements in the Damascus suburbs on August 21. We assess that the scenario in which the opposition executed the attack on August 21 is highly unlikely. The body of information used to make this assessment includes intelligence pertaining to the regime’s preparations for this attack and its means of delivery, multiple streams of intelligence about the attack itself and its effect, our post-attack observations, and the differences between the capabilities of the regime and the opposition. Our high confidence assessment is the strongest position that the U.S. Intelligence Community can take short of confirmation."They know where the rockets were launched from
Multiple streams of intelligence indicate that the regime executed a rocket and artillery attack against the Damascus suburbs in the early hours of August 21. Satellite detections corroborate that attacks from a regime-controlled area struck neighborhoods where the chemical attacks reportedly occurred – including Kafr Batna, Jawbar, ‘Ayn Tarma, Darayya, and Mu’addamiyah. This includes the detection of rocket launches from regime controlled territory early in themorning, approximately 90 minutes before the first report of a chemical attack appeared in social media. The lack of flight activity or missile launches also leads us to conclude that the regime used rockets in the attack.They also addressed the silly "false flag operation" accusation :
"We assess the Syrian opposition does not have the capability to fabricate all of the videos, physical symptoms verified by medical personnel and NGOs, and other information associatedwith this chemical attack."