The Hong Kong Alliance in Support of Patriotic Democratic Movements of China says police arrived at the homes and offices of its key members early on Wednesday to make arrests after it refused to hand over information requested by the force's national security unit.

Its vice-chairwoman, Chow Hang-tung, wrote on social media shortly after 6.30am that police were at her door.

The alliance said at least three other core members were also taken away, including Leung Kam-wai, Chan To-wai and Tang Ngok-kwan.

Police later confirmed that three men and one woman, aged between 36 and 57, were arrested on suspicion of failing to comply with the information request as stated in article 43 of the national security law's implementation rules.

Police did not rule out making further arrests.

On Tuesday, the alliance delivered a letter to the force, explaining why it had declined to hand over the information on its finances and operations and rejecting accusations it was a "foreign agent".

Security Secretary Chris Tang warned on Tuesday that law enforcers would act quickly against anyone who refused a request for information.
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Last updated: 2021-09-08 HKT 12:14