The mother and stepfather of slain teenager Michael Brown are under investigation in Ferguson, Missouri, for an alleged late October violent incident with other Brown family members, a fight that erupted over “Justice For Mike Brown” merchandise.

“The probe of the October 18 attack remains an ‘active investigation,’ according to Stephanie Karr, city attorney in Ferguson, Missouri,” the Smoking Gun reported on Monday.

The police report about the Oct. 18 incident, taken by reporting officer Stephanie Wilson, details how at about 1:23 p.m. that day, Officer Wilson was called to the parking lot of Red’s BBQ on West Florissant “for a report of 20 subjects fighting.”

“Upon arriving, I contacted Gordon, Pearlie [Brown’s paternal grandmother, the mother of Michael Brown, Sr.],” Officer Wilson wrote. “Gordon stated she was selling ‘Justice For Mike Brown’ merchandise with Cosey, Matthew and Petty, Tony on the above parking lot when a large group of about 20-30 subjects ‘jumped out of vehicles and rushed them.'”

One of the people who allegedly “rushed” at them was Brown’s mother, Lesley McSpadden. Gordon, Brown’s paternal grandmother, made sure Brown’s mother, McSpadden, was aware she was Brown’s grandmother, and said, “unless McSpadden could produce documentation saying she had a patent on her son’s name, she (Gordon) was going to continue to sell her merchandise.”

McSpadden’s mother, Desureia Harris–Brown’s maternal grandmother–then allegedly said to Gordon, Brown’s paternal grandmother: “You don’t know my grandson like that. I’m gonna tear this shit down.”

“Harris then proceeded to rip down t-shirts and other items hanging on the line,” Officer Wilson wrote.He continued:

Gordon was then repeatedly struck in the back and left side of the head by an unknown subject(s). Gordon stated there were 20-30 unknown subjects tearing her booth apart, and she was knocked to the ground. Gordon heard McSpadden yell to an unknown subject ‘that’s Caluina’s mom, get her ass.’ McSpadden then ran up and punched Gordon. A subject believed to be Keyanna Ewings also assaulted Gordon by punching her. Cosey and Petty were assaulted by unknown subjects during the incident. Over $1500.00 in merchandise (shirts and afghans) and a suitcase containing at least $400 in cash was stolen by unknown subjects. The suspects then fled the scene prior to police arrival.

The incident put Petty, one of the people with Brown’s paternal grandmother, in the hospital. “Petty was transported to Christian Northeast by EMS for injuries sustained during the assault,” Officer Wilson wrote.

The next page of the three-page police report notes that Gordon “identified the following subjects as ‘attackers’ during the incident: Bernard Ewings, Keyanna Ewings, Louis Head (McSpadden’s boyfriend) Tonya Ewings, Lesley McSpadden, and Desureia Harris.”

Since this incident, which the police are still investigating, the grand jury in Ferguson decided against indicting Officer Darren Wilson in the shooting death of Brown. That decision led to riots nationwide, centered in Ferguson–riots that started after Brown’s stepfather, Louis Head, urged crowds on Monday night to “burn this bitch down.”

On Laura Ingraham’s radio program on Wednesday, Missouri’s Lt. Gov. Peter Kinder called for Head to “be arrested and charged with inciting to riot” for that.