24 injured in third Hong Kong acid attack in the last 6 months. Mong Kok acid attack

Weird king of street attacks occur in Hong Kong where bottles containing corosive acid are droped from the top of the buildings by unidentified person. The most recent acid incident happened Monday night on Nielson Street injuring 24 people. It was the third attack in 6 months following that from 30th of May when 30 pedestrians were wounded and the first one in December 2008 that left 46 people hurt. Hong Kong authorities installed already a new surveillance system in the area -Mong Kok district, worth 219000 $.