Confusion is growing over just how much advance information federal law enforcement agencies had about the dead Boston Marathon bombing suspect Tamerlan Tsarnaev. We're getting a clearer picture of how he was radicalized.
Relatives of Tamerlan claimed a shadowy figure named "Misha" indoctrinated him into Muslim extremist views. But in an interview with the New York Review of Books, Misha claims he had nothing to do with the bombings, that he did not push Tamerlan towards violence, and that he hadn't even seen him for three years.
But Tamerlan had been on the radar of authorities, after a warning from Russia.
One influence on Tamerlan that is being investigated further is Islamic extremist leader Sheikh Feiz Muhammad, who has become so popular he has his own YouTube channel calling for the overthrow of the West.
Law enforcement sources said Tamerlan closely followed the sheik's radical teachings on the videos.
Rep. Peter King, R-N.Y., said the climate of political correctness in Washington is hampering terror investigations.
The man nicknamed Misha said he is cooperating fully with law enforcement and turned over his phone, computer and other personal belongings.
Tamerlan was killed in a shootout with police in Watertown. His brother, Dzhokhar, is in federal custody.
Authorities believe the brothers set off two bombs near the finish line of the Boston Marathon, killing three people and wounding dozens more.