(Bloomberg) -- Hong Kong police arrested four members of the group that has traditionally organized the city’s annual Tiananmen Square vigil, as authorities continued a broader push against the city’s pro-democracy activists. 

Chow Hang-tung, Leung Kam-wai, Tang Ngok-kwan, and Chan Dor-wai -- all members of the Hong Kong Alliance in Support of Patriotic Democratic Movements of China -- were arrested on Wednesday morning, local news outlets including Now TV reported, citing unidentified people. A police representative didn’t immediately respond to a request for comment. 

When the police were at Chow’s door, she texted a Bloomberg News reporter that police were “ringing the doorbell like crazy” and “trying the passcode” to her office. 

Chow was expected to appear in court on Wednesday for a bail appeal hearing of Gwyneth Ho, one of 47 pro-democracy activists arrested for their role in an unofficial opposition primary last year. Ho withdrew the application in the morning after judge Esther Toh rejected a request to lift media reporting restrictions.

The fresh wave of arrests comes a day after the city’s security chief, Chris Tang, vowed to take “swift and efficient” action against the activist group for refusing to cooperate or hand over documents related to a national security investigation.

In recent days, the group continued to resist a police request to turn over information on its membership and finances. Tsui Hon-kwong, a member of the group, filed a judicial review Tuesday over the police’s demands for documentation, asserting law enforcement officers were overstepping their power, according to media reports. 

On Sunday, Hong Kong’s Security Bureau said in a statement that failure to provide information in time could lead to a fine of up to HK$100,000 (US$12,870) and six months’ imprisonment. 

The Hong Kong Liaison Office, Beijing’s main agency overseeing the city, said in a statement on Sunday that the alliance was acting illegally and is nearing an end. 

“Any organization that is anti-China and disrupting Hong Kong will fall and history will prove it,” it said.

The alliance will hold an extraordinary general meeting on Sept. 25 to vote on its disbandment. 

(Updates throughout.)

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