The kind of homemade bomb used at the Boston Marathon has been used by terrorists in India, Pakistan, Afghanistan and Nepal according to an unclassified document released by Homeland Security in 2010.
That same year, instructions on how to construct the bombs were published in an online magazine with Al-Qaeda ties. That online publication, Inspire, was once edited by a man from Charlotte.
The article, "How to make a Bomb in the Kitchen of your Mom," was written in the Summer of 2010.
The editor, Samir Khan, denied to WBTV that he was a terrorist, but the magazine he wrote for encouraged and taught homegrown terrorism.
It told people to attack America from inside America.
Khan was killed in a drone attack in 2011.
A simple Google search also reveals multiple websites with information on how to build and detonate such a bomb.
The Homeland Security document warned the bombs were portable and easy to transport and conceal.
"Terrorists can exploit the innocuous appearance of easily transportable items such as pressure cookers to conceal IED components. Placed carefully, such devices provide little or no indication of an impending attack," the document said.
Similar bombs were used in the Mumbai train explosions that killed about 200 people in 2006. The same sorts of bombs were used in the 2010 attacks on Times Square and on World Vision International in Pakistan.
In Boston, investigators found a circuit board that they think may have triggered the bomb, according to the Boston Globe. CNN has said a timer set the bomb off and it was unlikely that a cell phone was used.
The Associated Press said a person briefed on the probe said 6-liter pressure cookers filled with ball bearings and metal was hidden inside duffel bags.
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