Hong Kong, China (CNN) -- Hong Kong police said they had arrested two men in connection with an acid attack that injured six people last month.



The pair -- ages 18 and 23 -- were taken into custody on Wednesday for questioning in the attack, which involved corrosive fluid being thrown from a building in the Causeway Bay shopping area.



A man and five women were injured in the attack, according to police.



By Thursday, the younger man was released on bail, while the other was still detained, said Michael Kwan, information officer for the Hong Kong police.



Authorities did not say whether the two were being investigated in other similar attacks in Hong Kong, and it was not clear whether the attacks involved a group, individuals or copycats.



Police are offering rewards totaling HKD $1.7 million ($219,000) for information leading to arrests in recent acid attacks in five areas of Hong Kong, including the shopping district of Mong Kok.



Hong Kong Security Secretary Ambrose Lee on Wednesday said that if an object is dropped from a building and injures someone in public, the culprit could face six months in jail and a HK $10,000 ($1,300) fine. The throwing of corrosive fluid or manslaughter could result in life imprisonment, he added.
where did the attack happen? The attack took place where? who was released on bail? Who were injured in the attack? what was the crime? how many were arrested? How many men were arrested in connection with the Hong Kong acid attack last month?
Causeway Bay shopping area. Causeway Bay shopping area. the younger man A man and five women attack two men two
question: where did the attack happen?, answer: Causeway Bay shopping area. | question: The attack took place where?, answer: Causeway Bay shopping area. | question: who was released on bail?, answer: the younger man | question: Who were injured in the attack?, answer: A man and five women | question: what was the crime?, answer: attack | question: how many were arrested?, answer: two men | question: How many men were arrested in connection with the Hong Kong acid attack last month?, answer: two