Police are offering a HK$100,000 reward in a bid to find the culprit who threw two bottles of acid from a Mong Kok building, injuring 46 pedestrians. The reward was announced by Chief Inspector Lam Chi-chung of Mong Kok police station, after police sealed off a section of Sai Yeung Choi Street South as they reconstructed Saturday's incident. 'We are offering the reward in the hope of gathering more information in connection with the case from different channels,' he said. He said anyone with information can contact police on 2398 6200. The reward is half of the amount police offered to catch one of the three alleged triad members who lobbed Molotov cocktails into the Top One Karaoke lounge in Tsim Sha Tsui in 1997, killing 17 people. Yesterday, a team of plain-clothes officers along with several government chemists returned to the scene at about 4pm to reconstruct Saturday's acid attack. Police first cordoned the pedestrian area of Sai Yeung Choi Street South outside Yuen King Building before four 500ml plastic bottles filled with a coloured liquid were tossed from the 10-storey block. A government chemist threw three of the bottles from the roof. The fourth was hurled out of a sixth-floor window of the same building. The bottles used in the reconstruction were the same size as the ones used in Saturday's attack. The main objective of the exercise, which lasted about an hour, was to establish exactly where the two bottles of acid were thrown from, the chief inspector said. With the culprit still on the loose, Mong Kok residents and shoppers expressed fear that there could be similar attacks. 'Why wouldn't I fear that? It's acid that could erode my face,' said Joe Chan, a youngster walking past Yuen King Building. One resident, Au Wang Fu-ling, was equally scared. 'I will avoid shopping there,' she said. About 80 police officers put up reward notices and conducted door-to-door inquiries in nearby buildings in the bustling district. Chief Inspector Lam said that so far no one had been arrested in connection with the case. Three teams of officers from Mong Kok police station, including an anti-triad squad, have been assigned to investigate the attack, which happened at about 5pm on Saturday. Two bottles of acid, thought to have been thrown from the roof of the Yuen King Building, smashed in the busy pedestrian area, which was packed with Christmas shoppers. Forty-six people were splashed with acid. They suffered burns to their face or limbs and some had holes in their clothing or backpacks. The injured were treated in hospital and discharged the same day. The incident took place in the same area where bricks were thrown from high-rises on 12 occasions between August and October in 2004. Police arrested a 42-year-old pimp in October of that year. He was sent to jail for 2? years in March 2005.