In addition to the FBI, other federal agencies have also mobilized staffers to get to St. Louis today, sources told ABC News.
A decision by the grand jury is expected soon, but St. Louis authorities said today that the grand jury is still meeting. The panel will decide whether or not to indict Ferguson Police Officer Darren Wilson for shooting Brown, who was unarmed, on Aug. 9.
Authorities are braced for a recurrence of angry protests that turned violent at times during the summer.
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