Obama says such "destructive" actions are criminal and those who are responsible should be prosecuted.
The president is speaking in Chicago a day after a Missouri grand jury declined to indict a police officer in 18-year-old Michael Brown's death.
Obama says he understands that many people are upset by that decision. He says their frustration is rooted in a sense that laws are not always being enforced "uniformly and fairly" in communities of color.
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(Photo: AP Photo/Jacquelyn Martin)