Steve Johnson, a leading researcher on the effects of hazardous material exposure at England's Cranfield University who has worked with Britain's Ministry of Defense on chemical warfare issues, agrees that "from the details we have seen so far, a large number of casualties over a wide area would mean quite a pervasive dispersal. With that level of chemical agent, you would expect to see a lot of contamination on the casualties coming in ,and it would affect those treating them who are not properly protected. We are not seeing that here."
Additional questions also remain unanswered, especially regarding the timing of the attack, being that it occurred on the exact same day that a team of UN inspectors was in Damascus to investigate earlier claims of chemical weapons use. It is also unclear what tactical goal the Syrian army would have been trying to achieve, when over the last few weeks it has managed to push back the rebels who were encroaching on central areas of the capital. But if this was not a chemical weapons attack, what then caused the deaths of so many people without any external signs of trauma?
"One alternative is that a large concentration of riot control agents were used here, which could have caused suffocation of large numbers of people who were pressed together in a bunker or underground shelter," says Gwyn Winfield, a veteran researcher and editor of CBRNe World, a professional journal the effects of chemical, biological and nuclear warfare. While riot-control substances, mainly various types of tear gas, are usually deployed in small quantities using hand-grenades, they can be used in much larger quantities in artillery shells or even dropped in barrels from aircraft as the U.S. Army did in Vietnam, trying to flush the Vietcong out of its underground bunkers. In large concentrations, these substances can cause suffocation, especially in closed spaces where many of the Syrian families would have been hiding from the bombing.
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