Anti-Tung activists yesterday said a hacker had struck their group's website which carried contents critical of Beijing's denial of universal suffrage to Hong Kong. The Anti-Tung Solidarity group fears more pro-democracy websites, which have previously helped mobilise public support at protests and elections, will be attacked in the run-up to the demonstration planned for July 1 and September's Legislative Council poll. Anti-Tung Solidary said its site - anti-tung.org - crashed after being hacked on Wednesday afternoon. Another popular pro-democracy news group using the same server - news://anti-tung.org/anti-23 - was also forced to suspend services as a result. Wai Wan-tung, Anti-Tung Solidarity's group secretary, said the incident had been reported to police. He said the server would be taken away for investigation by the Technology Crime Division. 'Internet websites were a powerful tool in mobilising people to participate in the mass protest last July and to vote in the district council elections last November,' Mr Wai said. 'We are worried that we are just the first victim. There might be more attempts to disrupt this powerful medium in the run-up to September's polls and the protest this July.' He would not speculate who was responsible for the cyber attack but said it was carried out in a professional way. 'This is definitely a calculated attack. It may be politically motivated. I don't know what the police could do. If the hacker is not in Hong Kong, the police can't do much about it,' he said. The website would not be ready for use for a week or two, he added. A police spokeswoman said the case had been classified as access to a computer with dishonest intent. No arrests have been made.