Up to 100 protesters gathered outside Victoria Prison last night, calling for the release of a right-of-abode claimant. Cheung Hoi-sang, 25, was arrested on Friday night at the Star Ferry concourse in Central in what police said was a routine stop-and-search operation. About 100 protesters then stormed the Waterfront police station in Central to try to secure his release. Father Franco Mella, who has been helping the abode seekers, yesterday staged a fast outside Victoria Prison, where Mr Cheung is being held pending repatriation. The Security Bureau said Mr Cheung failed to report to the Immigration Department when his permit to stay in Hong Kong expired on March 31. It said it had reason to believe 'he will abscond and evade repatriation if not detained'. The bureau added that 'no undertaking whatsoever had been given' that Mr Cheung would not be detained. But protesters claimed Mr Cheung's permit had been extended to April 22. Jackie Hung Ling-yu, project officer of the Justice and Peace Commission of the Hong Kong Catholic Diocese, said Mr Cheung had been suffering from mental stress. 'He is emotionally unstable and we worry so much he will commit suicide.' She said that many abode seekers and their families also suffered from serious mental problems. Police Commissioner Tsang Yam-pui said yesterday that the Government had never promised not to raid homes to arrest over-stayers. 'We will continue our routine action. Whether we will step up our operations, we cannot say at the moment. We do not rule out that we will enter homes for arrests.' He stressed that police operations would be 'legal and reasonable' and that only very minimal force would be used. Abode seekers' fears of being targeted for home raids escalated after abode seeker Lam Kin-man was arrested on Friday. More than 100 abode seekers and their parents clashed with police outside an immigration office at Kai Tak airport on Friday after learning that Mr Lam, 36, was moved on Thursday. Mr Lam's mother claimed her son was arrested by two police officers inside his North Point home. But police said that Mr Lam was picked up during a stop-and-search operation outside. Cheung Cho-sang, the vice-chairman of a group for the parents of abode seekers, said that many abode seekers were living in fear and some dared not stay at home. 'Officials told us they would not raid homes. They are liars,' he said.