22 November 2011, 14:50 | Updated: 30 March 2016, 13:50
Police hope a group of Halloween revellers can help them with their investigations into a report of a sexual assault in Worksop, Nottinghamshire.
The group was pictured on security cameras outside the Litten Tree pub in Victoria Square in the early hours of Sunday 30 October 2011.
Between 2am and 3am that same night a 23-year-old woman reports she was sexually assaulted in the Gateford Road/Sandy Lane area of the town.
Police are now urging the people pictured in the image to come forward, as they may have crucial information, and were in the area at the time.
Anyone who recognises anyone pictured, or who has any information about this incident is asked to contact Nottinghamshire Police on 101 or call Crimestoppers anonymously on 0800 555 111.