people that led to major changes in international regulations for its storage and handling him mr breckon gordon is a chemical weapons expert and former commanding officer of the u.k. chemical biological radiological and nuclear regiment he joins us now live via skype from bath in england could tell you where this is tell us more about ammonium nitrate and why it has the potential to cause such a catastrophic explosion as we saw yesterday if not stored correctly is i mean can it be stored safely. ammonium nitrate absolutely can be and you know it is very benign as a glossary and so what we call it like you can fix a plastic and duct tape since it's in other words to grow however as you said it is also an explosive and favorite of many terrorist groups these days what we call an excel or a trigger. this is fairly benign and material can be can create we call an accident burning pre-action which makes it heat our very rapidly and has a massive release of energy that we've seen in beirut and almost 3000 tons of this stuff it is absolutely devastated he's. been flattened almost by it. you know any p