In the days after last month's Boston marathon bombings, the city was on edge. Residents were holed up in their homes, under strict orders not to leave. Investigators sifted through countless hours of surveillance images trying to determine who might have carried out this heinous attack.
Then came a breakthrough.
Three days after the April 15 attack, the FBI identified the bombing suspects captured in surveillance images near the finish line, later identified as Tamerlan and Dzhokhar Tsarnaev.
And a manhunt was on.
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