Unrest Continues in Ferguson, Missouri

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A school bus full of children chant, "Hands up, don't shoot" as the vehicle drives past the scene where St. Louis Metropolitan Police earlier shot and killed a man wielding a knife in the St. Louis area, August 19, 2014.

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Security forces detain a demonstrator during a protest against the shooting of unarmed black teen Michael Brown, in Ferguson, Missouri, Aug. 20, 2014.