The Police Ombudsman's Office has appealed for witnesses to an incident near Camlough on the evening of Saturday 11 October.
Police were at the car park at Keggall View Point, Keggall Road, Camlough, at around 10.30pm when a female sustained an injury which required treatment at the scene by paramedics.
A spokesman for the Police Ombudsman's Office said: "We would be keen to speak to anyone who saw what happened or has any information they believe may assist our investigation into this incident;"
The number to call is 028 9082 8738.