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How did Ariana Grande concert bomber go unnoticed?
b'The 22-year-old man was on the radar of anti-terror cops, but he was still able to kill 22 people at an Ariana Grande concert in England with a suicide bomb. In this episode, Nancy Grace talks with Brian Levin, Director of\\xa0Center for the Study of Hate and Extremism, about the terror attack and how it could happen again in the United States.'