Former New York City Mayor Rudy Giuliani says Dzhokhar Tsarnaev's friends who were arrested could have prevented Officer Sean Collier's death. Anderson Cooper talked with Giuliani, Jeffrey Toobin, Christiane Amanpour and Amy Holmes about the Boston bombing case in a special edition of AC360°.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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