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Hilary Andersson investigates the radicalization of the two Boston marathon bombers and asks if America鈥檚 domestic anti-terrorism campaign is likely to be effective given their low key background. She spends time with the New York Police Department鈥檚 anti-terrorist squad to see how the latest technology is being used to protect New York from future attack.

And she talks to American Muslims who fear that law enforcement programmes are being used to profile, map and spy on them.

(Image of a New York City Police Department Counter Terrorism Officer patrolling Times Square. Credit: AFP/Getty Images)