Federal law enforcement is boosting its presence in the Saint Louis area, preparing in case there's violence when the grand jury decides whether to indict Officer Darren Wilson in the shooting death of Michael Brown.
The FBI and the ATF are both sending extra personnel, including SWAT teams.
The grand jury is actually deliberating in Clayton, Missouri, just a few miles away.
Residents there are on alert.
Jason Carroll reports for OutFront.
Weighing in on the safety concerns is Former St. Louis police chief Daniel Isom. He was appointed state public safety director by Missouri's governor three weeks after the death of Michael Brown.