The following comes from the USG unclassified intelligence report released today:
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 the morning, 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.
Local social media reports of a chemical attack in the Damascus suburbs began at 2:30 a.m. local time on August 21. Within the next four hours there were thousands of social media reports on this attack from at least 12 different locations in the Damascus area. Multiple accounts described chemical-filled rockets impacting opposition-controlled areas.
Three hospitals in the Damascus area received approximately 3,600 patients displaying symptoms consistent with nerve agent exposure in less than three hours on the morning of August 21, according to a highly credible international humanitarian organization. The reported symptoms, and the epidemiological pattern of events – characterized by the massive influx of patients in a short period of time, the origin of the patients, and the contamination of medical and first aid workers – were consistent with mass exposure to a nerve agent. We also received reports from international and Syrian medical personnel on the ground.
We have identified one hundred videos attributed to the attack, many of which show large numbers of bodies exhibiting physical signs consistent with, but not unique to, nerve agent exposure. The reported symptoms of victims included unconsciousness, foaming from the nose and mouth, constricted pupils, rapid heartbeat, and difficulty breathing. Several of the videos show what appear to be numerous fatalities with no visible injuries, which is consistent with death from chemical weapons, and inconsistent with death from small-arms, high-explosive munitions or blister agents. At least 12 locations are portrayed in the publicly available videos, and a sampling of those videos confirmed that some were shot at the general times and locations described in the footage.
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 associated with this chemical attack.
We have a body of information, including past Syrian practice, that leads us to conclude that regime officials were witting of and directed the attack on August 21. We intercepted communications involving a senior official intimately familiar with the offensive who confirmed that chemical weapons were used by the regime on August 21 and was concerned with the U.N. inspectors obtaining evidence. On the afternoon of August 21, we have intelligence that Syrian chemical weapons personnel were directed to cease operations. At the same time, the regime intensified the artillery barrage targeting many of the neighborhoods where chemical attacks occurred. In the 24 hour period after the attack, we detected indications of artillery and rocket fire at a rate approximately four times higher than the ten preceding days. We continued to see indications of sustained shelling in the neighborhoods up until the morning of August 26.