Alleged Boston Bombers' July 4th Plot

The World
The suspected Boston marathon bombers didn't originally plan to attack the sporting event, focusing instead on the city's 4th of July celebrations. That's according to law enforcement officials familiar with what the surviving suspect, Dzhokhar Tsarnaev, allegedly told FBI agents in the days after his capture. Anchor Aaron Schachter speaks with Frontline and The World's Arun Rath for an update on the investigation.
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