A $500,000 reward went on offer yesterday for information on armed robbers who sprayed bullets into a crowd of shoppers, MTR passengers and police during a jewellery shop raid in Central last Wednesday. The Cantonese-speaking trio, believed to be armed with Chinese Black Star pistols, shot four people as they fled through the Landmark building and Central MTR station after robbing the Precision Watch Company in Swire House. Hongkong Bank employee Lau Sze-man, 23, was fatally shot in the head while a second woman, 23-year-old Le Jardin bar manager Tina Noden, was hit in the stomach and leg and was still in poor condition at Queen Elizabeth Hospital last night. Policeman Chan Kar-cheong, 22, was shot in the leg, and bystander Siu Ming-sang, 58, was shot in the stomach, and were both in satisfactory condition. A second policeman, Fan Yin-fai, twisted his ankle and was in fair condition. The reward matches the sum offered for information on Hong Kong's most wanted man, Yip Kai-foon, who is wanted in connection with a 1992 Shamshuipo robbery during which his gang fired 65 shots at police. Yip is thought to be hiding in Zhuhai, bordering Macau, in Guangdong Province. Macau detectives are investigating whether Yip was involved in the enclave's largest robbery earlier this month when $40 million worth of gambling chips were stolen from a casino in the Hyatt Regency Hotel. Film of the hold-up showing the gang, one of whom was armed with an assault rifle, has been reviewed to see if it matches a Hong Kong police photograph of Yip. A third $500,000 reward was offered for information on the stabbing last September of auxiliary policeman Ng Ka-wing, killed as he patrolled Pat Tin estate. The latest reward was announced yesterday by the Deputy Secretary for Security, Ken Woodhouse, during a Fight Crime Committee meeting. Police have circulated photographs of the robbers to marine police, border security and other branches. Organised Crime and Triad Bureau teams have been reviewing video footage of the robbery filmed by the store's security camera. Bureau chief Albert Kwok Cho-kuen said his teams were checking details of similar armed hold-ups, working on the premise the gang had struck before. The robbers shunned face masks and gloves, apparently to avoid attention in busy Chater Street, and police hope to identify them with photographs and finger prints. ''This shop had an electronically-controlled door, so you have to show your face to be allowed in,'' Chief Superintendent Kwok said. ''The film shows three men come into the shop and start emptying the showcases.''