The Police Ombudsman has appealed for information about an incident which happened at Belfast's Sydenham bypass in the early hours of 3 June this year.
It happened shortly after 3am when police approached a man close to the pedestrian bridge near George Best Belfast City Airport.
Anyone who saw an incident involving police and a pedestrian in that area, or who saw a man walking in the area between 3am and 3.30am on 3 June 2012, is asked to contact the Police Ombudsman's Office.
The number to call is the Police Ombudsman's freephone witness appeal line number - 0800 032 7880.