Tamerlan Tsarnaev

What did the U.S. know about Tamerlan Tsarnaev and his radicalization before the Boston Marathon bombings? A new review aims to find out.

FOX News Radio's Courtney Kealy reports:

Inspectors General of the CIA, Justice and Homeland Security have begun reviewing the intelligence before the attack.

(President Obama) "Based on what I've seen so far, the FBI performed its duties."

President Obama at yesterday's news conference.

Meanwhile, U.S. law enforcement is trying to determine whether Tsarnaev trained with militants on a trip to Dagestan in 2012. Russian agents had been monitoring him on the trip after he disappeared for several days.

His widow has agreed to have his body released by the medical examiner's office to his family.

Courtney Kealy, FOX News Radio.

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