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(NECN) - The top US intelligence official is reviewing how sensitive information was shared before the deadly Boston Marathon bombings.
Director of National Intelligence James Clapper agreed to the review to determine whether anything was missed that could have stopped the suspects blamed for the attacks.
Lawmakers have suggested that an intelligence breakdown may have contributed to the attacks.
President Obama says the government is reviewing security procedures to guard against self-radicalized people in this country,
Still, he says people should feel safe.
On Monday, the FBI visited the home of bombing suspect Tamerlan Tsarnaev's in-laws in Rhode Island.
They left with bags of items likely to see if DNA taken from Tsarnaev's wife, Katherine Russell, matches with female DNA found on a piece of a pressure cooker used to make one of marathon bombs.
Authorities aren't sure if that DNA is from an accomplice or a victim.
As for surviving suspect, Tamerlan’s brother, Dzhokhar Tsarnaev -- Judy Clarke -- a lawyer known for helping high-profile clients such a Tuscon shooter Jared Loughner and Unabomber Ted Kaczynski escape the death penalty -- has joined his defense team.