![Boston Marathon bombs made from old fashioned pressure cookers filled with nails, ball bearings, source says Boston Marathon bombs made from old fashioned pressure cookers filled with nails, ball bearings, source says](https://s.hdnux.com/photos/64/40/47/13765058/4/1200x0.jpg)
Boston Marathon bombs made from old fashioned pressure cookers filled with nails, ball bearings, source says
![Boston Bomb Clues Surface: Lethal Devices Believed Built From Pressure Cookers; Hotels, Rentals Canvassed - WSJ Boston Bomb Clues Surface: Lethal Devices Believed Built From Pressure Cookers; Hotels, Rentals Canvassed - WSJ](https://s.wsj.net/public/resources/images/NA-BV961A_PRESS_G_20130416185405.jpg)
Boston Bomb Clues Surface: Lethal Devices Believed Built From Pressure Cookers; Hotels, Rentals Canvassed - WSJ
![The devastatingly simple mechanics of the #Boston marathon bomb – an annotated graphic – Engineering & Technology magazine The devastatingly simple mechanics of the #Boston marathon bomb – an annotated graphic – Engineering & Technology magazine](https://engtechmag.files.wordpress.com/2013/04/boston-bomb-attack.jpg?w=640)
The devastatingly simple mechanics of the #Boston marathon bomb – an annotated graphic – Engineering & Technology magazine
![Greg Blair on Twitter: "Diagram of how pressure cooker bomb works # bostonmarathon #bomb #breaking #boston http://t.co/mA1cZscy3X" / Twitter Greg Blair on Twitter: "Diagram of how pressure cooker bomb works # bostonmarathon #bomb #breaking #boston http://t.co/mA1cZscy3X" / Twitter](https://pbs.twimg.com/media/BIFI6wnCQAA12cE.jpg)