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>> reporter: the missouri national guard trying to keep order on the streets of ferguson. they're under the command of the state highway patrol which has so far failed to ease tensions here. >> what happens is, the peaceful protesters gather, but other element blends in. and now they blend in and that's what's been causing us some issues. >> reporter: as families and businesses prepared for another night of violence, president obama pleaded for peace and order. >> so the community in ferguson that is rightly hurting and looking for answers, let me call once again for us to seek some understand...

State highway patrol, which has so far failed to quell tensions here. >> what happened here, peaceful protesters gather but the other element blends in. now they blend in and that's what's been causing us some issues. >> reporter: as family and businesses prepared for another night of violence, president obama pleaded for peace and order. >> to a community in ferguson, rightly hurting and looking for answers, let me call once again to seek some understanding rather than simply holler at each other. >> reporter: at the heart of all this unrest, what happened between these two men, darren wilson...