fragments of rockets and shells that bore sign was sarin gas. it was a concerted attack by rocket artillery and i am prepared to believe that the opposition would use chemical weapons and no evidence that they have got capability for rockets and the attack. >> that is a co element. surface to surface missiles as a sarin nerve agent that was used in damascus. is there a way to trace those specific rockets back to equipments that was solid in the syrian government? >> it doesn't appear they could do that. and observers said at the time, the fighting in that area continued after the first reports of chemical agents were revealed, that the fragments of rockets and artillery shells that might have had markings