BALIK PULAU (THE STAR/ASIA NEWS NETWORK) - Penang police have detained a female participant who took part in the "naked sports event" in Teluk Kampi, Penang National Park.
The private music teacher, 34, was picked up at an undisclosed location in the southwest district at 9.55pm on Thursday.
Balik Pulau OCPD Supt Lai Fah Hin said police believed the arrest could help shed light in their investigation.
He said police have also identified two key persons - retired teacher Chew Tok Hwa, 57, and one Albert Yam - who were participants and organisers of the nude event labelled as Penang Nude Sports Games 2014.
"We hope all those participants can come forward and help us to facilitate the probe,'' he added.
It was earlier reported that a video clip, titled Penang Nude Sports Games 2014, was uploaded to video-sharing website Vimeo about two months ago and showed participants, including someone resembling the woman, strolling about and dancing with each other in the nude.
They also sat around a fire and camped for the night, taking pictures of one another.
The clip, which was uploaded by Albert Yam, was removed before 2pm on Tuesday.
At the same press conference, Supt Lai released 13 photographs of the participants, whose ages ranged from the 20s to the 50s. He also released 15 names of the participants.
They are Kok Hong (director from Singapore), Albert Yam (organiser from Singapore) and Chew Tok Hwa (organiser from Malaysia).
The Malaysians identified were Carmen Chan, Thomas Kong, Janice, Justin Ang, Michale and Ellen.
The foreigners were Terry and Lionel Lau (Singaporeans), Newman and his girlfriend (not identified, both Myanmar nationals), Janes Kumar (India) and Marvin Cuevas (the Philippines).
It was earlier reported that Penang police had sought the help of Interpol to trace eight foreigners who were among the 18 people taking part in the events.
Supt Lai said statements have been recorded from 16 people, including two rangers and two boatmen who ferried them to the beach from Teluk Bahang jetty.
He said the police had received 11 reports on the incident.