Life Details of Tenn. Shooter Emerge

Bits and pieces have emerged over the past few days about Muhammad Youssef Abdulazeez's troubled life. But two significant pieces of the puzzle missing: Why did he ambush two military sites, killing four Marines and a sailor? And was he propelled to do so by his own demons or at the direction of someone else? Until last Thursday's shooting, the Kuwait-born 24-year-old was not on the radar of terrorism investigators.

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