CLAYTON, Mo. (AP) — The St. Louis County prosecutor’s office has announced plans for an 8 p.m. news conference to announce whether a grand jury has indicted a Ferguson police officer in the shooting death of Michael Brown.

The announcement will be made at the downtown courthouse in the county seat of Clayton.

The grand jury has been considering charges against Darren Wilson. He’s the white suburban St. Louis officer who fatally shot the black 18-year-old after a confrontation in August, sparking sometimes-violent protests.

Barricades have been erected around the building, and more than 20 Missouri state troopers were seen silently assembling with rifles, 3-foot batons, riot shields and other equipment. Some nearby businesses boarded up their windows, just as many shops have already done near the site of Brown’s death in Ferguson.