Ten pistols and about $1 million in cash were seized yesterday when police raided a Mongkok flat used as an illegal gun factory. Officers arrested five Hong Kong men during raids at another 25 locations in different parts of the territory in a crackdown on a criminal syndicate. The operation, involving about 100 officers from the Organised Crime and Triad Bureau who had been hunting Hong Kong's most wanted man, Kwai Ping-hung, and his six accomplices, began shortly after dawn yesterday. However, officers refused to say whether the criminal syndicate police targeted yesterday was Kwai's gang, or if it was linked to them. Kwai's gang is blamed for shooting and injuring two policemen last year. During the raid in Mongkok, officers wearing bullet-proof vests and carrying submachine-guns raided an Argyle Street unit and arrested a 46-year-old man. The suspect was escorted to a nearby Hak Po Street flat where 10 pistols converted from air guns and about $1 million in cash were found hidden inside a wardrobe in one of the bedrooms. A small quantity of the drug Ice was also found. The pistols were sent to the Forensic Firearms Examinations Bureau for tests. Police said no ammunition was seized. 'We are investigating whether they are capable of being fired and are in breach of the Firearms and Ammunition Ordinance and what they were going to be used for,' Superintendent Simon So Kam-shing said. A source said the five suspects were allegedly linked to a criminal syndicate. The Hak Po Street unit where the haul was discovered is about 200 metres from where officers Sze Kwan-ming and Lai Chi-wai were gunned down in May last year. Both officers suffered serious injuries but have since recovered. Kwai and his accomplices disappeared after fleeing into Hak Po Street after the attack. Following the incident, police threw a cordon round the area and conducted door-to-door searches but found no trace of them. Kwai's gang is also believed to be responsible for a $1.5 million robbery at a watch shop in Mongkok in June last year in which two shots were fired. A police spokesman said the operation was still ongoing and expected it to last for several days. Last night the five suspects, aged between 40 and 53, were being held for questioning at Wan Chai police station.