Data-sharing troubles raise questions in Marathon case 2 separate watch lists named Boston suspect ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page Left: JOHANNES HIRN/LANDOV; Right: Handout Marathon bombing suspects Tamerlan Tsarnaev (left), pictured in 2009, and Dzhokhar Tsarnaev, in a yearbook photo. Left: JOHANNES HIRN/LANDOV; Right: The Lowell Sun/Julia Malakie/AP Tamerlan Tsarnaev practiced boxing at the Wai Kru Mixed Martial Arts center in Boston in 2009 (left), and received a boxing trophy in 2010. Left: BOSTON REGIONAL INTELLIGENCE CENTER; Right: Robin Young vis AP Dzhokhar A. Tsarnaev, pictured at a Cambridge gas station early Friday morning (left) and after graduating from Cambridge Rindge and Latin High School. ANNE REARICK Tamerlan Tsarnaev got his hands laced at a Golden Glove event in Lowell on 2006 (left) and posing with former professional boxer Micky Ward. Glenn DePriest/Getty Images) Tamerlan Tsamaev (left) during a boxing in Utah in 2009. VKontakte/AFP/Getty Images An undated image of what appears to be Dzhokhar Tsarnaev taken from VKontakte, a Russian social media site. Bob Leonard Dzhokhar A. Tsarnaev (left) and Tamerlan Tsarnaev were pictured on Boyston Streen shortly before the Boston Marathon bombings. David Green/AP What appears to be Dzhokhar A. Tsarnaev (left, in white hat) is shown walking away after the Marathon bombings on Monday. CBS NEWS/AFP/Getty Images This image shows Tsarnaev, who was captured after being found hiding in a boat in a Watertown backyard. Reuters Medical workers treated Dzhokhar A. Tsarnaev moments after he was captured.