In this undated photo provided by the Dagestani branch of the Federal Security Service William Plotnikov, right, poses for a photo. Security officials
In this undated photo provided by the Dagestani branch of the Federal Security Service William Plotnikov, right, poses for a photo. Security officials suspected ties between elder Boston bombing suspect Tamerlan Tsarnaev and the Canadian, an ethnic Russian named William Plotnikov, who had joined the Islamic insurgency in the region.