would never, never be used against civilians or the syrian people during this crisis. at any circumstances no matter h t crisis would evolve. >> reporter: syria has the middle east's biggest arsenal of chemical weapons. we know it has nerve gas. we know mustard gas, sarin gas and variety of other toxic weapons. we're not sure about the biological side they have. united states and israel are monitoring every day if not every day but hour by hour where the stockpiles have been moved that is happening in the past week. in terms of violence in the country, megyn, the country is trying to reclaim the back the capital. retaking rebel positions from last week. in the past few hours hundreds of rebel fighters have tried storming the city. no indication did, they have been. we believe they have large control of the northwest part of the city. of course in quetta falls to