POLICE are investigating a serious sexual assault at Skipton's Strata nightclub in the early hours of Sunday.
They say a man was attacked in a cubicle in the male toilets at about 3am.
Now officers want to speak to night-clubbers and, in particular, to a man who alerted door staff to the incident.
It is believed that some people may have taken photos or video footage shortly afterwards.
A police spokesman said: "We are asking these people to contact us as a matter of urgency, along with anyone else who has any information about the incident."
A 19-year-old man has been arrested in connection with the incident and is on police bail while further inquiries are carried out.
Anyone who can help is asked to contact Harrogate CID on 101 or Crimestoppers anonymously on 0800 555111. Please quote reference 12140115512.