Detectives in Derry are renewing an appeal for information following reports of a serious sexual assault in the city earlier this month.
Shortly before 1am on Tuesday the 1st of November, it was reported that a teenage girl was sexually assaulted by an unknown male in the area of Edenmore Street and Northland Road.
The male is described as being dressed in black and wearing a scream mask with blood over the face.
Halloween celebrations were taking place in Derry on this night and Police would wish to speak with anyone who was wearing a scream costume on the night in question so they can be eliminated from their enquiries.
Anyone with any information is asked to contact the PSNI Rape Crime Unit on or, if someone would prefer to provide information without giving their details, they can contact the independent charity Crimestoppers and speak to them anonymously.