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ST. LOUIS (AP) _ Missouri Gov. Jay Nixon is calling for “peace, respect and restraint” when a grand jury announcement is made on whether a white police officer will be charged with fatally shooting a black 18-year-old.

At a press conference Monday, Nixon said he did not know whether the grand jury has decided to indict Ferguson Officer Darren Wilson for the Aug. 9 shooting of Michael Brown.

Nixon was flanked by the state’s public safety director and leaders from St. Louis city and county.  Public Safety Director Dan Isom, St. Louis County Executive Charlie Dooley and St. Louis Mayor Francis Slay spoke at the  University of Missouri-St. Louis Monday evening. They said peaceful protesters will be respected, and even allowed to potentially slow down traffic on streets.

But state and local leaders said they will not tolerate the destruction of property or violence.