Via WFB:
An al Qaeda magazine containing bomb-making instructions helped the Boston Marathon bombers construct the deadly explosive devices that killed three people and wounded more than 180, according to a U.S. official close to the ongoing investigation.
The official confirmed that the disclosure about how the pressure cooker bombs were built came during hospital room exchanges between investigators and wounded bombing suspect Dzhokhar Tsarnaev.
The link between the bombers and the magazine is the main clue to emerge so far identifying the bombers as Islamist extremists seeking to wage jihad against the United States.
Tsarnaev said the English-language terrorist magazine Inspire provided details on the pressure cooker bombs, according to the official. The official commented after NBC News and Fox News Channel reported the detail.