The Police Ombudsman's Office has appealed for information about an incident which happened as police arrested two people in Newcastle, Co Down, last month.
An altercation took place as officers arrested a male and a female in the Railway Street area of the town at about 4pm on 18 May.
Anyone who saw what happened is asked to contact the Police Ombudsman's freephone witness appeal line on 0800 032 7880.