Hong Kong acid attacks

Mong Kok acid attacks
Notice about the acid attack incident in May 2009 displayed on a police vehicle.
Location	Several along Sai Yeung Choi Street South, Mong Kok, Hong Kong
Date	13 December 2008, at 5:15 pm 16 May 2009, at 4:47 pm 8 June 2009, at 8 pm 9 January 2010, at 9:30 pm (UTC+8)
Attack type	Acid attacks
Weapons	Plastic bottles full of corrosive liquid
Deaths	0
Injured	130 total (mostly minor) (46+30+24+30)
Perpetrators	Unknown

The Mong Kok Acid Attacks (旺角高空投擲腐蝕性液體傷人案) were a series of acid attacks from 2008 to 2010 where plastic bottles filled with drain cleaner, a corrosive liquid, were thrown onto shoppers on Sai Yeung Choi Street South, Hong Kong, a pedestrian street and popular shopping area. Originally, a reward of HK$100,000 was offered for information about the perpetrator(s), but following the second incident it was raised to HK$300,000, and cameras were planned to be installed in the area. The third incident occurred the very day the cameras were turned on. The fifth incident happened after Hong Kong government announced its new strategies against the incident.