Source: Boston marathon bombing suspects targeted July 4th event

The Tsarnaev Brothers, behind barricades at the Boston Marathon, before the bombs went off.
The Tsarnaev Brothers, behind barricades at the Boston Marathon, before the bombs went off.

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    Source: Suspects targeted July 4th event

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Source: Suspects targeted July 4th event 01:42

A law enforcement source says Boston bombing suspects Tamerlan and Dzhokhar Tsarnaev initially targeted July 4th celebrations. Jason Carroll reports.