Tyrone Harris identified the victim as his son, according to The St. Louis Post-Dispatch. The elder Harris said shortly after 3 a.m. that his son had just gotten out of surgery.
He said his son graduated from Normandy High School and that he and Brown "were real close."
The father called the police version of events "a bunch of lies." He said two girls who were with his son told him he was unarmed and was drawn into a dispute involving two groups of young people.
St. Louis County prosecutors on Monday announced 10 charges against Tyrone Harris Jr. — five counts of armed criminal action, four counts of first-degree assault on a law enforcement officer and a firearms charge. He is being held on a $250,000 cash bond.
Belmar said during the press conference, 2:30 a.m., that there is a "small group of people out there that are intent on making sure we don't have peace that prevails.”
"We can't sustain this as a community," he said, the Post-Dispatch reported.
Belmar said two groups of people exchanged gunfire on the west side of West Florissant Avenue at the same time the shooting took place. Forty to 50 shots rang out, he said. "It was a remarkable amount of gunfire," he added. The shots sent protesters and reporters running for cover.
The people doing the shooting "were criminals," he said. "They were not protesters."
The four detectives, who have six to 12 years of experience, will be placed on administrative leave, a standard practice after a police-involved shooting. They were not wearing body cameras, Belmar said.
The Ferguson Action Council, a coalition of protest groups formed after the death of Brown, released a statement on Monday condemning the use of plainclothes officers without body cameras and "overly aggressive policing" during Sunday's protests.
"After a year of protest and conversation around police accountability, having plainclothes officers without body cameras and proper identification in the protest setting leaves us with only the officers’ account of the incident, which is clearly problematic," Kayla Reed, a field organizer for Organization of Black Struggle, said in the statement.
St. Louis County Police said in a Monday morning media advisory that two teenage boys were also shot, at roughly 2:15 a.m. near the Michael Brown memorial in Ferguson. The two victims, both of whom survived, said an unidentified black man shot them from inside a vehicle, according to the police statement.