According to his accomplice and brother, the two of them had no help. Tamerlan planned the attack in it's entirety after watching videos and reading the online magazine "Inspire" published by al-Qaeda. It is known that the Russian government warned the U.S. in 2011 that Tamerlan may have terrorist ties. The FBI did investigate him and chose to close the case.
What is known is that for six months in 2011 Tamerlan traveled to Russia to visit his father. Questions investigators want the answers to? What else did he do while he was there? Did he train with an al Qaeda group? And if so, what happened to Tamerlan? What made him so angry? What turned him against a country that his family immigrated to years ago for a better life? What made him hate the country that helped him so much? I guess we should all stay tuned.
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