Boston suspect was under FBI surveillance, mother saysMOSCOW (Reuters) – One of the two ethnic Chechens suspected by U.S. officials of being behind the Boston Marathon bombings had been under FBI surveillance for at least three years, his mother said. Zubeidat Tsarnaeva told the English-language Russia Today state television station in a phone interview, a recording of which was obtained by Reuters, that she believed her sons were innocent and had been framed.