And the google translation, at least, makes the situation much more murky than that tweet implies. Perhaps the difference between the 281 deaths observed in the videos and the 1500 they report in the "balance sheet" has to do with further deaths that occurred in the hospitals, rather than at the site of the attack.
"Based on a systematic technical analysis of 47 original videos of the events of August 21, a first liquidation account, district by district, the number of victims has been realized. In view of the single sample videos have been identified at least 281 deaths, localized in the East Ghouta (districts Ain Tarma, Douma, Erbin of Jobar, Kfar Batna of Qas Alaa, of Zamalka) and West (neighborhood Mudamiyat Sham).
"Our own data confirm that in the hospital Duma, half of the victims are women and children and in 50% of cases, death is immediate. Physicians CONCLUDE a high concentration of toxic has been employed.
"Other independent assessments, for example MADE BY Doctor Without Borders, are state of at least 355 dead. Several techniques STATEMENTS according different sources, assess the balance sheet has about 1500 dead. The work realized by our experts, consisting of a modelize the impact of a chemical attack on the people of the cited sites are Coherent with this number.
Besides the fact that the victims do not carry personal injury and rattle symptoms are primarily generalized seizures, nausea, vomiting, miosis, hypersecretion of saliva, dyspnea, choking, unconsciousness, Coherent clinical signs with poisoning chemicals. Of confirmed cases of cross-contamination of health care workers have been reports To several sources."