The police chief yesterday made a personal apology to the victims after a detective constable - described by a judge as a sexual predator - admitted raping a young woman and indecently assaulting her and three others in a police station last year. The apology by Tang King-shing came after Leung Lai-chung, 30, pleaded guilty in the Court of First Instance to four charges of indecent assault, one of rape and one of perverting the course of justice. The court heard Leung had asked the four victims, aged 16 to 21, to go to Mong Kok police station between November 14 and 24 to help in the investigation of cases in which they were complainants or defendants. He took them to the suspect assembly room in the identification parade suite, where he sexually assaulted them, raping one of them afterwards. After the assaults, he sent text messages to their mobile phones. On November 25, Leung learned the 19-year-old rape victim had made a police report and offered her HK$100,000 to withdraw her complaint, saying he did not want to lose his job and go to prison. Mr Justice Darryl Saw adjourned sentencing to September 18, pending psychiatric and psychological reports. Referring to Leung as a 'sexual predator', the judge said he had obviously abused his power and trust as a police officer and his pursuit of the victims after the assaults aggravated his offences. The court heard Leung also faces trial in the District Court in relation to using the police computer to find the victims. He will appear on December 12 on 11 charges of accessing a computer with dishonest intent. Defence barrister David Boyton said Leung, who was under immense pressure from work and family, had only intended to 'court' his victims but had been overcome by lust. Leung had been commended more than 50 times for his performance at work, he said. While attached to the vice squad in 2002 and 2003, he was often sent out as an undercover agent because he looked like a drug addict and had helped smash more than 60 drug dens in Yau Ma Tei and Tsim Sha Tsui, with more than 600 people arrested. Mr Tang's calls yesterday to the four victims were in fulfilment of a promise made earlier this year when he said 'if the constable is convicted, we owe an apology to the victims'. A police spokesman said Leung had been suspended from duty since the case came to light and a disciplinary hearing would be held when all legal proceedings were completed. In a letter to the court, Leung offered the victims a 'deep apology', saying he had approached them because he had lost confidence after the breakdown of his marriage in 2007 and wanted 'short-term relationships'. He had suffered from tremendous stress since his father died of lung cancer three years ago, and had helped his elder brother, also a police constable, repay a debt of several hundred thousand dollars. Leung said joining the force 10 years ago had fulfilled a childhood dream. The court heard Leung had asked the police commissioner and senior officers to write him reference letters but the requests were rejected.