Three men were released from jail yesterday after the Court of Appeal ruled police may have framed them. Fan Man-wai, 26, Lam Chi-kin, 25, and Chi Kai-lung, 26, had each been sentenced in the District Court to 3.5 years' jail last November after being involved in a bar brawl with nine off-duty police officers. It had been alleged they punched and kicked the constables in a Wan Chai karaoke bar on March 22 last year, after an argument over a toilet door. A fourth man, Gary Ng Chun-hing, 30, was also found guilty. The Court of Appeal yesterday quashed their sentences. Outside court, their lawyer, Peter Ip Tak-keung, said: 'Justice does prevail.' Justices Noel Power, Nicholas Barnett and Mohammed Saied said they suspected the officers lied about when they made their statements in order to incriminate the men. The suspicion emerged when an on-duty officer said the constables were given pen and paper to make their statements soon after arriving at the police station. The officers had told the court they made their statements 15 hours after the incident. The Court of Appeal questioned what had happened to earlier statements. The justices agreed with the defence that it was possible the officers could have colluded to perfect a story that would incriminate their alleged attackers. Explaining the decision, Mr Justice Power said: 'The credibility of the police officers was in question. 'We are driven reluctantly to the conclusion that we cannot consider the conviction safe and satisfactory.' A police spokesman said an official investigation would be launched and promised that the matter would be treated 'seriously'. Liberal Party legislator Selina Chow Liang Shuk-yee said steps had to be taken to prevent similar question marks being raised about future convictions. To ensure this, she called on the Independent Police Complaints Council to examine all criminal cases in which allegations were raised about the role of police officers involved. Human Rights Monitor director Law Yuk-kai warned: 'This is not the first time we have had this. 'It is in officers' common interest to have an 'if you will look after me, I will look after you' attitude.' He said special training for police was needed to eradicate the problem.