Police have launched an investigation after more nude pictures purported to be of Hong Kong pop and movie stars were posted online. The pictures included one of a young man and woman, apparently captured from a video and said to be Twins duo member Gillian Chung Yan-tung and singer-actor Edison Chen Koon-hei. Another purported to be actress Cecilia Cheung Pak-chi. The pictures appeared a day after doctored pictures with Chung's head on the half-naked body of another woman were posted. A police spokeswoman said the Commercial Crime Bureau was investigating 'two reported cases of publishing indecent articles on the internet'. The latest pictures came to light after an internet user posted a message on popular newsgroup discuss. com.hk saying more nude photos of Gillian Chung had been uploaded to another newsgroup 'featuring lots of 'kong nui' [Hong Kong girls] photos'. This message was removed about 5.40pm, but pictures had already begun circulating on the internet. Chen's management company, Rich and Famous, said the company was seeking legal advice and might make a complaint to the police. 'We believe this incident was more likely a joke in bad taste,' a spokesman said. 'But it appears [the person who put up the photos] shows an intention to attack Edison deliberately and we should stop that.' Chung's record company, Emperor Entertainment Group, which has already reported the case to the police, released another statement yesterday urging the media not to publish the photos. Lawyer Wong Kwok-tung said uploading computerised photos degrading Chung could be criminal defamation, as it damaged her image as 'a decent celebrity'. However, those who downloaded the images should bear no legal responsibility. In 2006, a magazine that published photos portraying Chung changing her clothes was classified as class II indecent, meaning it should not have been sold to people under the age of 18.