Detectives hunting Hong Kong's most wanted man - Kwai Ping-hung - and his six accomplices were last night questioning two men following the seizure of three pistols, 45 rounds of ammunition and a silencer in Sai Kung. A police source said the three 7.62mm-calibre pistols were probably made in an underground firearms manufacturing plant on the mainland and brought to Hong Kong by one of the two suspects, aged 36 and 42. Police said the mainland-made guns could be bought for about $1,000 over the border. Ballistic officers were examining the three handguns to find whether they had been used to gun down officers Sze Kwan-ming and Lai Chi-wai in Kowloon City on May 22. The two constables were hit by 7.62mm bullets at close range by four men, one of whom was Kwai, police claim. Both officers suffered serious injuries but have since recovered. The haul was discovered when a Sai Kung-bound green cab was stopped at a police roadblock by officers from the Kowloon East Region emergency unit at the junction of Tai Mong Tsai Road and Yan Yee Road in Sai Kung West Country Park at 10am. The cab was driven by a 42-year-old SAR man and there were two male passengers on board. 'The three pistols, wrapped in newspaper, and ammunition were found in a nylon bag carried by one of the passengers. There was also a silencer,' a police spokesman said. The taxi driver was not arrested but was helping with inquiries. The two suspects were being questioned by the Organised Crime and Triad Bureau, tasked to trace Kwai's seven-man gang. Police have offered a $2 million reward for capture of the gang, which was also believed to have been responsible for a $1.5 million robbery on a watch shop in Mongkok on June 25. During that raid, three gunmen fired two shots.