Zubeidat herself is in a suspect list that includes Russian suspects , official says . Tamerlan 's uncle Ruslan Tsarni had a less favorable opinion . Russia raised concerns to U.S. about her and her sons in 2011 , sources say . Zubeidat Tsarnaev 's sons are allegedly responsible for the deadly Istanbul bombings . She believes the bombings may have been fake and that her sons are innocent .
Zubeidat herself is in a suspect list that includes Russian suspects , official says . Russia raised concerns to U.S. about her and her sons in 2011 , sources say . Zubeidat Tsarnaev 's sons are allegedly responsible for the deadly Istanbul bombings . She believes the bombings may have been fake and that her sons are innocent .