heat would build up inside that pipe or pressure cooker finally would just that blast is actually an explosion. it s the steel breaking of the metal. and these are also, i mean that information you just said, that s widely available on the internet. you re not saying anything that s not out there. but pressure cookers i ve talked to a bomb expert and fbi expert. the reason you would use a pressure cooker and why it s rarely used in the united states, it s usually in jungles, buried in dirt. you re trying to protect your device from the environment. that s generally where they ve been used. colombia, thailand, maybe even in pakistan. so it is kind of odd that they would use that here in a domestic setting. but, again, they don t know they don t have any suspect at all. it s also important to point out that this is an investigation where all of the resources and intelligence community are being used and they will have a backlog of intelligence they have to go through, interce