HONG KONG (CNN) -- Thirty people were treated for burns after they were hit with two bottles of acid Saturday at a Hong Kong shopping district, police said.
The pedestrians suffered various degrees of burns, none of which were serious, police said.
The incident at the busy Mong Kok shopping district is similar to one that left 46 people injured in December 2008. The attack occurred on a Saturday around the same time in the same area with bottles containing similar liquids.
Police have not ruled out the possibility that the two attacks could be connected.
A 24-hour hotline has been set up for information on both incidents.
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