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ST. LOUIS, MO - AUGUST 24: Tracy Martin, the father of Trayvon Martin, holds up his hands at Peace Fest in Forest Park on August 24, 2014 in St. Louis, Missouri. Martin's teenage son was shot and killed by neighborhood watch captain George Zimmerman. Michael Brown, whose teenage son Michael was shot and killed in nearby Ferguson, Missouri on August 9, also spoke at the event. Michael Brown Jr. will be buried tomorrow. (Photo by Scott Olson/Getty Images)

ST. LOUIS, MO - AUGUST 24: Tracy Martin, the father of Trayvon Martin, holds up his hands at Peace Fest in Forest Park on August 24, 2014 in St. Louis, Missouri. Martin's teenage son was shot and killed by neighborhood watch captain George Zimmerman. Michael Brown, whose teenage son Michael was shot and killed in nearby Ferguson, Missouri on August 9, also spoke at the event. Michael Brown Jr. will be buried tomorrow.  (Photo by Scott Olson/Getty Images)