Chicago police, fire and Office of Emergency Management officials said they would be conducting an active shooter drill and simulation in The Loop Sunday morning.
The joint public safety exercise was scheduled to take place between 10 a.m. and 4 p.m. in the area around Chase Tower on 10 S Dearborn St.
Street closures include Dearborn from Madison to Monroe, Clark from Madison to Monroe, Madison from Clark to Dearborn, and Monroe from Clark to Dearborn, officials said.
Roads were said to be closed, and residents can also expect a large number of emergency service vehicles and personnel in the immediate vicinity.
The exercise is not open to the public.