A young boy looks at a man lying in a parking lot with gunshot wounds in Ferguson, Missouri, Aug. 9.

An 18-year-old man was shot by police officers after gunfire broke out in Ferguson, Missouri, Sunday night, where demonstrators had gathered on the one-year anniversary of the death of Michael Brown.

The shooting occurred around 11:15 p.m. when police told the crowd to clear the area near Ferguson and West Florissant Avenues after traffic was blocked and businesses were damaged.

Hundreds had gathered in the city to mark one year since Brown, an unarmed black teenager, was killed by a white police officer — a death that prompted angry protests, as well as reflection on policing in the black community.

Speaking at a news conference early Monday morning, St. Louis County Police Chief Jon Belmar said that four plainclothes officers in an unmarked SUV shot and wounded Tyrone Harris Jr. after he shot at the vehicle from close range multiple times.

Belmar said that the suspect was in a "critical, unstable condition, in surgery."

The officers involved in the shooting — who have between 6 and 12 years of service each — have been placed on administrative leave.

Belmar said that while the incident was "a tragedy," "there are a small group of people out there who are intent on making sure we don't have peace that prevails."

A St. Louis County police spokesperson said Monday that Harris Jr. was charged on four counts of assault on law enforcement in the first degree, five counts of armed criminal action, and one count of discharging or shooting a firearm at a motor vehicle. He is being held on $250,000 cash bond.