With the town on lockdown and one bomber ineffective, the hunt is on for the 2nd fugitive.
Day 1: e
Day 2: J
Day 3: B
Day 4: 9
[This is the final installment of an ABC News digital special report “5 Days,” which tells the hour-by-hour, day-by-day story of the investigation into the 2013 Boston Marathon bombing, with behind-the-scenes details based on interviews and evidence gathered by the FBI and Boston law enforcement agents who worked the investigation.]
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