Sadness swept the nation Monday afternoon when two explosions occurred at the Boston marathon at the finish line, killing at least three and injuring more than 130 others. More information about the devices used in the incident has been released, revealing that the pair of bombs were created out of pressure cookers filled with ball bearings. This indicates that the intention was to inflict the maximum amount of damage possible. You will see in the images above a twisted metal container, a battery, and a circuit board.

[via Independent]