Demonstrators block a busy intersection while marching through the streets to protest the August shooting of Michael Brown, Sunday, Nov. 23, 2014, in St. Louis. Ferguson and the St. Louis region are on edge in anticipation of the announcement by a grand jury whether to criminally charge officer Darren Wilson in the killing of 18-year-old Brown. (AP Photo/David Goldman)

Photos: Ferguson on edge

Ferguson and the St. Louis region are on edge in anticipation of the announcement by a grand jury whether to criminally charge officer Darre…