A judge yesterday ordered a trial for a teenager after the defendant claimed he had been forced by police into admitting a robbery offence. Cheuk Pui-kong, 16, pleaded guilty to one count of robbery but then told Court of First Instance judge Madam Justice Clare-Marie Beeson he did not agree with the facts as read out in court by prosecutor Alain Sham. Cheuk's defence counsel, Andrew Leung, said his client had been under 'police brutality' after his arrest. 'There was no guidance present ... He was only a 15-year-old boy, therefore he agreed to plead guilty,' Mr Leung said. The defence counsel said his client admitted the charge but did not agree to the summary of facts. Cheuk and three other youths, Tam Wai-chun, Chin Ki-yau, Kwok Tze-kin, all 16, were each charged with one count of robbery. All four pleaded guilty yesterday but only Cheuk disputed the summary of facts in court. The prosecution said the four young youths, armed with metal pipes, robbed a group of six people, aged between 17 and 21, who were having a birthday party at King's Park Recreation Ground in Yau Ma Tei on the evening of February 28 last year. Three victims were hit on their heads in the attack, the court was told. Prosecutor Mr Sham reacted angrily after hearing the defence allegation, saying he was surprised because a draft document had been sent on March 19 to all the counsels and solicitors for the four defendants to confirm the facts of the case. He said he did not receive any response or dispute about the facts stated from Cheuk and his lawyers. 'It is a very serious allegation made by the defendant against the police officers. It is also inappropriate for a prosecutor to accept the guilty plea made by Cheuk,' said Mr Sham, who requested a trial for Cheuk. Madam Justice Beeson agreed with the prosecutor and ordered a trial. She also rejected Cheuk's guilty plea. 'Since police brutality was alleged, I am not going to accept the guilty plea [from Cheuk],' the judge said. She adjourned the case to April 15 for a pre-trial review. She also adjourned the sentencing for Tam, Chin and Kwok until after the hearing for Cheuk is completed. All four defendants were allowed to extend their bail.