seeing had this rocket motor attached to this, and then this front end, the central core extension bent up on the ground. and what people were not seeing was this larger canister that had broken into many pieces when the munition hit the ground. >> reporter: he says the rockets with the large payload chamber at the top looked something like this. cnn cannot verify the information. he says he can't rule out that the rockets could have come from the rebel side but -- >> my best guess though, was that it was the assad government because the amounts of sarin you need, the design of the munition, the cleverness with which it was put together, sort of implies a state actor. >> reporter: the syrian government has repeatedly denied launching the august 21st attack. now russia's proposal a to put syria's stockpile under international control is being