Ferguson Police Department

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Pro-police demonstrators protest outside the Ferguson Police Department Sunday, March 15, 2015, in Ferguson, Mo. (AP Photo/Jeff Roberson)

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Protesters in Ferguson, Mo., gather across the street from the Ferguson Police Department following the resignation of the city's police chief in the wake of a U.S. Justice Department report. (AP Photo/Jeff Roberson)

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Officers from the St. Louis Police Department walk through a crowd of protesters outside the Ferguson Police Department, Thursday, March 12, 2015, in Ferguson, Mo. Two police officers were shot early Thursday morning in front of the Ferguson Police Department during a protest following the resignation of the city's police chief in the wake of a U.S. Justice Department report. (AP Photo/Jeff Roberson)

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Protesters gather near the Ferguson Police Department, Wednesday, Nov. 25, 2014, in Ferguson, Mo. Missouri's governor ordered hundreds more state militia into Ferguson on Tuesday, after a night of protests and rioting over a grand jury's decision not to indict police officer Darren Wilson in the fatal shooting of Michael Brown, a case that has inflamed racial tensions in the U.S. (AP Photo/Charlie Riedel)

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Officer Darren Wilson has resigned from the Ferguson Police Department amid threats to himself and the city's embattled law enforcers. (ABC News via Associated Press)

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Police in riot gear use tear gas to clear the street in front of the Ferguson Police Department after the announcement of the grand jury decision not to indict police officer Darren Wilson in the fatal shooting of Michael Brown, an unarmed black 18-year-old, Monday, Nov. 24, 2014, in Ferguson, Mo. (AP Photo/Charlie Riedel)

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National Edition News cover for November 25, 2014 - Ferguson cop faces no state charges in teen’s death: A protester squirts lighter fluid on a police car as the car windows are shuttered near the Ferguson Police Department after the announcement of the grand jury decision not to indict police officer Darren Wilson in the fatal shooting of Michael Brown, an unarmed black 18-year-old, Monday, Nov. 24, 2014, in Ferguson, Mo (AP Photo/Charlie Riedel)

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Protesters gather in front of the Ferguson Police Department before the announcement of the grand jury decision about whether to indict a Ferguson police officer in the shooting death of Michael Brown, Monday, Nov. 24, 2014, in Ferguson, Mo. A Missouri grand jury heard evidence for months as it weighed whether to indict Ferguson police Officer Darren Wilson in the Aug. 9 fatal shooting of Brown. (AP Photo/Charlie Riedel)

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A protester speaks in front of the Ferguson Police Department before the announcement of the grand jury decision about whether to indict a Ferguson police officer in the shooting death of Michael Brown, Monday, Nov. 24, 2014, in Ferguson, Mo. A Missouri grand jury heard evidence for months as it weighed whether to indict Ferguson police Officer Darren Wilson in the Aug. 9 fatal shooting of Brown, which was followed by sometimes violent protests. (AP Photo/Charlie Riedel)

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Protesters gather in front of the Ferguson Police Department before the announcement of the grand jury decision about whether to indict a Ferguson police officer in the shooting death of Michael Brown, Monday, Nov. 24, 2014, in Ferguson, Mo. A Missouri grand jury heard evidence for months as it weighed whether to indict Ferguson police Officer Darren Wilson in the Aug. 9 fatal shooting of Brown. (AP Photo/Charlie Riedel)

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A protester squirts lighter fluid on a police car as the car windows are shuttered near the Ferguson Police Department after the announcement of the grand jury decision not to indict police officer Darren Wilson in the fatal shooting of Michael Brown, an unarmed black 18-year-old, Monday, Nov. 24, 2014, in Ferguson, Mo (AP Photo/Charlie Riedel)

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A protester squirts lighter fluid on a police car as the car windows are shuttered near the Ferguson Police Department after the announcement of the grand jury decision not to indict police officer Darren Wilson in the fatal shooting of Michael Brown, an unarmed black 18-year-old, Monday, Nov. 24, 2014, in Ferguson, Mo (AP Photo/Charlie Riedel)

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Protesters gather in front of the Ferguson Police Department before the announcement of the grand jury decision about whether to indict a Ferguson police officer in the shooting death of Michael Brown, Monday, Nov. 24, 2014, in Ferguson, Mo. A Missouri grand jury heard evidence for months as it weighed whether to indict Ferguson police Officer Darren Wilson in the Aug. 9 fatal shooting of Brown. (AP Photo/Charlie Riedel)