Even if the Russians had been specific, why should the FBI have done anything? They've been taught for two years now that jihad is a peaceful spiritual struggle, a noble and beautiful thing. To have acted on this would have been "Islamophobic."
"Russia caught Tamerlan Tsarnaev and mother on wiretap discussing jihad," by Eileen Sullivan and Matt Apuzzo for the Associated Press, April 27 (thanks to Kenneth):
WASHINGTON (AP) — Russian authorities secretly recorded a telephone conversation in 2011 in which one of the Boston bombing suspects vaguely discussed jihad with his mother, officials said Saturday, days after the U.S. government finally received details about the call.
In another conversation, the mother of now-dead bombing suspect Tamerlan Tsarnaev was recorded talking to someone in southern Russia who is under FBI investigation in an unrelated case, officials said.
The conversations are significant because, had they been revealed earlier, they might have been enough evidence for the FBI to initiate a more thorough investigation of the Tsarnaev family.
As it was, Russian authorities told the FBI only that they had concerns that Tamerlan and his mother were religious extremists. With no additional information, the FBI conducted a limited inquiry and closed the case in June 2011....
In the past week, Russian authorities turned over to the United States information it had on Tamerlan and his mother, Zubeidat Tsarnaeva. The Tsarnaevs are ethnic Chechens who emigrated from southern Russia to the Boston area over the past 11 years.
Even had the FBI received the information from the Russian wiretaps earlier, it’s not clear that the government could have prevented the attack....
Indeed not. Politically correct Keystone Kops who are forbidden to study Islam and jihad in connection with terrorism are unlikely to have been able to do anything effective against an Islamic jihadist.