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Report details missed chances ahead of Marathon attacks

FBI’s review of Tsarnaev faulted; communication gaps unearthed

WASHINGTON — An Obama administration review of the Boston Marathon bombings released Thursday revealed communication gaps within Boston’s Joint Terrorism Task Force — a group that relied on office conversations and sticky notes to relay intelligence — and portrayed the FBI’s initial review of Tamerlan Tsarnaev in 2011 as somewhat cursory.

It paints yet another damaging portrait of law enforcement agencies’ missed opportunities to scrutinize Tsarnaev as he became radicalized in the two years before he and his younger brother allegedly planted two bombs at the Boston Marathon.

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