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Via ABC News:
Months before the 2013 terror attack on the Boston Marathon, accused bomber Tamerlan Tsarnaev posed in front of a black flag often associated with jihad with a fellow worshiper at a Boston-area mosque, according to an FBI report obtained by ABC News.
The FBI report, which did not include the photo, describes Tsarnaev and his friend Khairullozhon Matanov as “seated in front of a black flag with a sword and a shadada phrase,” referring to the Muslim statement of faith, and adds that the photo was taken “at the mosque.” Similar flags have become symbols of jihad, used by al Qaeda and al Qaeda-linked extremist groups. […]
The black flag picture is part of the evidence prosecutors said Matanov deleted from his computer to obstruct the investigation into the bombings, which in turn led to the arrest of the Kyrgyzstani national last month on federal charges. He has pleaded not guilty and is currently being held without bail.
The FBI report says the alarming photograph was taken on Eid-Al-Adha, also known as the Festival of Sacrifice, the highest of Muslim holidays, but does not say exactly when. A source familiar with the investigation told ABC News it was taken during the August 2012 celebration. The FBI report does not identify the mosque where the photograph was taken.