A handgun which was found concealed in a BMW in Sham Shui Po was bought by a suspected triad member for about HK$5,000 at an illegal market in the city, according to police. The unloaded revolver was discovered after officers from the Organised Crime and Triad Bureau intercepted the man, 38, in a police ambush in Fat Tseung Street at about 9pm on Wednesday. The arrest was made when he arrived in the car and got out of the vehicle. Police said he was subdued after a brief struggle. During the car search, officers had to remove the right front wheel and unscrew the wheel well panel before finding the handgun hidden inside, according to a police source. 'The gun was wrapped in a cloth and attached with a plastic cord to a vehicle part,' the police source said. 'Without information, it would have been hard to discover the weapon in a normal inspection.' A spokesman confirmed that a tip-off led to the arrest and seizure. 'The revolver has a short barrel and is similar to the type of police revolvers used by detectives,' the source said. 'We believe it is a factory-made weapon. It's not a new piece but we believe it has been reconditioned. It contains all the necessary gun components such as a firing pin. It is now being examined to find out whether it is in good condition and serviceable.' The source said that the force's ballistics experts were also checking whether the gun had been used in any crimes in the city. The hooded suspect was later taken to a public housing flat in nearby Lei Cheng Uk Estate, where officers conducted a search. Police said no bullets were found. Initial investigations had shown that the man was an active triad member. 'Intelligence indicated that the gun was purchased from an arms dealer in Hong Kong recently and the suspect bought it for his own use,' the source said. Investigations were continuing to find the arms dealer and discover how the revolver was smuggled into Hong Kong. The man was being detained by police for questioning and no charge had been laid. Seven guns were seized last year and six in 2007. There have been no reports of crimes involving genuine handguns for two years.