Boston Marathon bomb scene pictures taken by investigators show the remains of an explosive device. The photos were produced by the Joint Terrorism Task Force of Boston. Reuters
Exclusive: Government Doc Shows How Closely Boston Marathon Bombers Followed Al Qaeda Plans -- NBC
A detailed analysis of the bombs used at the Boston Marathon and during a firefight between the suspects and law enforcement shows how closely the bombmakers followed instructions from the digital al Qaeda magazine “Inspire,” according to a government document obtained by NBC News.
The unclassified report from the Terrorist Explosive Device Analytical Center found that the pipe bombs allegedly thrown from a car by Dzhokhar and Tamerlan Tsarnaev during last Friday’s chase through Watertown, Mass., resembled the design described in “How to Make a Bomb in the Kitchen of Your Mom,” an article in the first issue of the English-language magazine. At least one of the Watertown bombs used an elbow pipe wrapped in black tape, as discussed in “Inspire.”
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My Comment: What strikes me about this story is that the bombers were so confident of these instructions that they did not even bother to do a test.