Another acid attack in Sham Shui Po last night might be linked to three previous attacks in the district, police said.
At least one pedestrian was burned when a Blue Girl beer bottle full of what police termed 'a strong acid' was thrown from a building in Sham Shui Po into Apliu Street near No 212 Apliu Street at about 6.30pm.
Police said the other attacks in the district also involved acid contained in Blue Girl beer bottles.
In last night's attack, the bottle of acid landed on the zinc roof of a stall, splashing at least one pedestrian, who complained to the stall-holder about a burn to his cheek. The stall-holder helped the middle-aged victim wash his cheek with water and the man left the scene.
A woman stall-keeper said: 'There was a bang, and people looked up and saw lots of smoke. And someone called the police ... the bang was loud. The pedestrians ran away immediately.'
The latest attack is the 12th in a series of attacks in the city - eight in urban areas and three in the New Territories - since December 2008, which have injured more than 100 people. Mong Kok has been the worst hit with all attacks there involving plastic bottles containing drainage solvent easily available in stores. A reward of HK$900,000 for information on the Mong Kok cases remains unclaimed.
'The fluid has been examined initially by a scientific evidence officer. He said it is a strong acid,' Stephen Tarrant, assistant Sham Shui Po district commander (crime), said, adding that laboratory tests would fully reveal the chemical make-up of the bottle's contents.