Investigators into the Boston Marathon bombings are trying to figure out what triggered two young suspects into carrying out the worst US terror attack since 9/11. The Tsarnaev brothers, who'd spent around half their lives living in the US, are believed to have carried out Monday's twin explosions which killed 3 and wounded more than a hundred. The suspects' family claims they had been under FBI surveillance for the past 5 years, and refuses to believe the young men carried out the atrocity. Former FBI agent Coleen Rowley joins RT studio.
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