A businessman who claims he has been threatened and assaulted as a result of feeding information to the ICAC yesterday admitted possessing a semi-automatic pistol for his own defence. Chan Hoi-ngam, 34, who trades in computer and food products, was arrested at his office on June 1 last year wearing the gun in a holster and possessing an extendable baton under his desk. Prosecutor Jonathan Man Tak-ho said Chan had told police he had been threatened and harassed several times by triads and so had bought the pistol and ammunition on the mainland. The police also found a silencer for the gun, spare bullets and a canister of CS gas in his briefcase. Mr Justice Frank Stock said Chan had told the police he was a potential witness for the Independent Commission Against Corruption. He claimed to have been helping anti-graft officers with an investigation which dated back to 1994. The company boss said people had been arrested as a result of the inquiry and he claims he was assaulted in the Netherlands in 1994. Chan said that two weeks before his arrest he had received two threatening telephone calls. He said he had reported this to the ICAC at the time. He admitted buying the Hungarian-made semi-automatic pistol, 9mm ammunition and the silencer on the mainland. Chan said he had bought the CS gas canister in the US, also for self-defence. He admitted possessing the firearm, ammunition and CS gas without a licence. The judge adjourned the case so the prosecution could investigate Chan's claims of being an ICAC witness. This might include contacting authorities in the Netherlands, the judge said. 'I think the court is entitled to be told by the prosecution whether the account given by the defendant, extending over hours and hours, was investigated and whether it is accepted that he was an ICAC potential witness,' the judge said. He suggested he might order the prosecution to pay legal costs for the time wasted by not having the information available yesterday. Chan was remanded in custody until February 26 when the case will return to the Court of First Instance.