Boston Bombing Day 4 | The Firefight: 'I Thought We Were Gonna Die'
Law enforcement's desperate search for two young killers takes a dramatic, violent turn.
Day 1: http://bit.ly/1TldQIe
Day 2: http://bit.ly/1XKMH2J
Day 3: http://bit.ly/1Tle9TB
[This is the fourth of five installments 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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