Two workers were killed when a metal platform they were standing on collapsed into a lift shaft at a construction site inside the police headquarters in Wan Chai yesterday. The incident has prompted the Association for the Rights of Industrial Accident Victims to demand that the Labour Department launch a safety campaign to warn site workers of potential hazards. Association chief executive Chan Kam-hong said 14 out of 23 workers killed in construction site accidents this year had fallen to their deaths. The accident happened at 9am, just after the five-metre-long platform was lifted into the lift shaft on the ninth floor of the police complex under construction in Arsenal Street. The acting Chief Occupational Safety Officer of the Labour Department, Chan King-chuen, said initial investigations showed the 1.8-tonne platform gave way soon after Cheung Ka-chun, 21, and Sin Muk-kan, 42, walked on to the structure and removed a hook. The workers and the structure plunged into the lift shaft and landed on the second floor. Mr Chan said the two labourers were not wearing safety belts at the time. 'The two workers might have escaped from death if they wore safety belts. We are still investigating whether they were required to wear safety belts during the procedure,' he said. He said safety belts and ropes were found on the ninth floor of the building. Cheung and Sin, who had lost consciousness when an emergency crew arrived, were taken to Queen Mary Hospital, where they were declared dead. Mr Chan said the Labour Department would look into whether the platform had been properly built and installed, as well as other related factors. He said construction work would be suspended while the investigation was under way. Assistant Wan Chai divisional commander (operations), Chief Inspector Tse Kwok-wai, said police would compile a death report after receiving the investigation results from the Labour Department. Work on the $3.23-billion police complex, which is being carried out by a Hip Hing and China State joint venture company, began in late 2000 and is scheduled to be completed in 2004. Sin Muk-kan is survived by his wife and two sons, aged six and 11. Cheung had planned to get married in the next few months.