Updated

Top St. Louis city and county officials are urging residents to remain calm once a grand jury decision in the Michael Brown case is announced.

St. Louis County Executive Charlie Dooley and St. Louis Mayor Francis Slay said at a joint news conference Wednesday that while protesters' civil rights will be respected, looting and violence will not be tolerated. They say they're ready for whatever happens.

Dooley says much progress in regional race relations has been made in the three months since Brown, who was black, was shot by Ferguson police Officer Darren Wilson, who is white.

The grand jury weighing whether to charge Wilson is expected to make a decision this month, raising concerns that protests could turn violent as they sometimes did in the days after the Aug. 9 shooting.