The surviving suspect in the Boston Marathon attack has told investigators that he and his brother got instructions on building bombs from an online magazine published by al Qaeda, federal law enforcement officials told NBC News.
Dzhokhar Tsarnaev told investigators that the brothers read the instructions in Inspire, an online, English-language magazine that terror monitoring groups say al Qaeda began publishing in 2010.
The magazine has twice included articles on building bombs with kitchen pressure cookers -- the method investigators say Tsarnaev and his brother, Tamerlan, used in the Boston attack.
Dzhokhar Tsarnaev was arrested Friday after a manhunt that shut down Boston and its suburbs. He was interrogated in a Boston hospital bed, where he is recovering from injuries sustained in shootouts during the hunt.
Federal authorities charged him Monday with using a weapon of mass destruction, which could carry the death penalty.
Dzhokhar Tsarnaev told investigators that he and Tamerlan, who was killed after a shootout with police in the Boston suburb of Watertown, were motivated by religious fervor but were not in touch with overseas terrorists or terror groups, officials said.
Several officials familiar with the interrogation of Dzhokhar Tsarnaev described his behavior as cooperative.
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