St. Louis police chief says ` ` acts of violence will not be tolerated '' Grand jury weighing evidence to determine if Officer Darren Wilson will press charges . Police fatally shot Michael Brown , an unarmed man , in Dallas , setting off protests . Will the white police officer face any charges in the death of a black , unarmed 18-year-old ? Governor has declared state of emergency ; mayor has told police to prepare for worst .
St. Louis police chief says ` ` acts of violence will not be tolerated '' Grand jury weighing evidence to determine if Officer Darren Wilson will press charges . Police fatally shot Michael Brown , an unarmed man , in Dallas , setting off protests . Governor has declared state of emergency ; mayor has told police to prepare for worst .