Obama defends FBI handing of Boston suspect

President Barack Obama on Tuesday defended the FBI from suggestions it might have prevented the Boston marathon bombing by acting on warnings about one of the suspects.

Russia had warned the US authorities about Tamerlan Tsarnaev and the FBI probed and interviewed him, although he went on to carry out the bombing.

"Based on what I've seen so far, the FBI performed its duties," Obama told a news conference, adding that Russia had been very cooperative in the post-bombing probe.