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Internet he was doing. they were watching every step of him and telling today, this is a terrorist act. >> reporter: the fbi confirmed in 2011 they interviewed the older brother and family members, but it did not say how many times. it was at the request of russian intelligence ak considereding the a senior u.s. official. the fbi said that the request was based on information that tsarnaev was a follower of radical islam and a strong believer and had changed drastically since 2010. they said the...

Fbi two years before the bombings, was already stirring up controversy before the bombing in watertown. the chairman of the security committee. >> if they let him out of their sights, then that is an issue for me. >> reporter: the mother said that agents had been harassing her son for years. >> they knew what my son was doing, and they knew what actions and what sites on the internet he was doing. they were watching every step of him and telling today, this is a terrorist act. >> reporter: the f...