Watch American Gangster online: Episode 4 The D.C. Snipers

In October, 2002, the ‘D.C. Snipers’ introduced a new kind of terror to the US. public. For three weeks, the killers shot people at random - ordinary citizens doing the most mundane things - shopping, pumping gas, waiting for a bus. John Muhammad, 42, was a deranged dad on a mission to get back his kids. Lee Boyd Malvo, 17, was a homeless juvenile desperate for a father – who John Muhammad methodically transformed into a boy soldier.

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