The Police Ombudsman's Office has appealed for information about the discharge of AEP rounds by police during disorder in north Belfast on 12 July.
Six rounds were discharged during disturbances in the Ardoyne area of the city.
The Police Ombudsman's Office investigates all discharges of police firearms in Northern Ireland.
A spokesman said: "The rounds were discharged in the Brompton Park area between 7.30pm and 9.10pm on 12 July. We would be keen to hear from anyone who saw them being fired and can tell us anything about what was happening at the time.
"We would be particularly keen to speak to anyone who has video footage of the rounds being discharged."
Anyone with information is asked to contact the Police Ombudsman's freephone Witness Appeal line on 0800 032 7880.