One billboard is on Manchester Road near the Mason Road intersection. The other is located off I-70 and Fifth Street in St. Charles, facing west.
One resident reportedly treated for minor injuries.
Gov. Jay Nixon has ordered U.S. and Missouri flags at state buildings to be flown at half-staff Wednesday to honor Chief Petty Officer Mason.
Police ay he burglarized homes to feed heroin addict
Woman admits cheating on taxes, helping family members do the same.