A Crawley mountaineering club is being investigated after allegations of indecent offences.
Now defunct, the informal project was around during the early 1970s for young people interested in mountaineering.
A 70-year-old man has been released under investigation, after being interviewed about assaults on a boy then aged in his early teens.
Investigator Lucy Hailes said; “We are investigating allegations of indecent offences involving this project and would like to talk to anyone who has any information about it.
If you can help please contact us online or by calling 101, quoting reference 47170067235.