BALIK PULAU - 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 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, believed to be in his 40s - who were participants and organisers of the nude event labelled as Penang Nude Sports Games 2014.
Chew last known address is 1722, Lorong Inai 6/1, Taman Ria Jaya, Sungai Petani while Yam is a Singaporean.
"We hope all those participants can come forward and help us to facilitate the probe.
"Those with information on their whereabouts can also contact the nearest police stations or contact investigation officer ASP Mohd Sani Mat Ali at 012-5424455," he said during a press conference Friday.
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 one Albert Yam, was removed before 2pm on Tuesday.
At the same press conference, Supt Lai also released 13 photographs of the participants, whose ages ranged from the 20s to the 50s.
They also released 15 names or Christian 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 who is unidentified (Myanmar nationals), Janes Kumar (India), Marvin Cuevas (the Philippines).
It was earlier reported that Penang police have sought the help of Interpol to trace eight foreigners who were among the 18 people taking part in the events.
Supt Lai said they have recorded statements 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.