west midlands police
Police said there were a "number of victims", but could not give information about the severity of their injuries.
An independent misconduct panel said he should be dismissed without notice.
A 52-year-old man has been arrested on suspicion of wounding.
Sixteen-year-old Ramani Morgan is believed to have been attacked during a fight which spilled out of a house and into the street.
The chief superintendent of West Midlands Police said the incident could have been "the worst thing" some officers had "ever seen".
Seven police officers were injured during the incident.
Thousands of attendees were forced to leave the sold-out event early.
James Teer was shot dead in a residential street where he had been playing football with friends.
West Midlands police is investigating the incident.
The 16-year-old will appear in Westminster Magistrates Court on Tuesday.