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    Officials: FBI saw 'change in behavior' in Boston man

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Officials: FBI saw 'change in behavior' in Boston man

A man police killed in Boston was under terror surveillance. CNN national security analyst Juliette Kayyem and former FBI official Shawn Henry discuss.

Officials: FBI saw 'change in behavior' in Boston man

A man police killed in Boston was under terror surveillance. CNN national security analyst Juliette Kayyem and former FBI official Shawn Henry discuss.