From Boston to Los Angeles, police departments are bracing for large demonstrations when a grand jury decides whether to indict a white police officer who killed an unarmed black teenager in Ferguson, Missouri.
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The St. Louis County grand jury, which has been meeting since Aug. 20, is expected to decide this month whether Officer Darren Wilson is charged with a crime for killing 18-year-old Michael Brown after ordering him and a friend to stop walking in the street on Aug. 9.

The shooting has led to tension with police and a string of unruly protests there and brought worldwide attention to the formerly obscure St. Louis suburb, where more than half the population is black but few police officers are.