I wonder when people will wake up and realize the very air we breath can be used for explosives?
In a more simplistic/literal way, compressed air can make a hell of an explosion.
What do you expect from uneducated illiterates?
Boston Marathon bomber Tamerlan Tsarnaev walked into a New Hampshire fireworks store two months before his deadly attack and asked for the "biggest and loudest" kit in the store -- then got another set free.
Just saw that the bombers got their explosives by buying from a fireworks shop.
Boston bombing : Man got crackers from same store as Times Square bomber - The Economic Times
But on the news this morning the announcer said there was news where he bought the "gun powder".