The arrests come as authorities crack down on dissent in the semi-autonomous Chinese city. Police charged former newspaper publisher Jimmy Lai with sedition on Tuesday. His Apple Daily newspaper shut down after its assets were frozen
More than 200 officers were taking part in the search, police said. They had a warrant to seize relevant journalistic materials under a national security law enacted last year.
The six were arrested early Wednesday under a colonial-era crimes ordinance for conspiracy to publish a seditious publication, and searches of their residences were underway, police said.
According to the local South China Morning Post newspaper, police arrested one current and one former editor at Stand News, as well as four former board members including singer and activist Denise Ho.
Police did not identify those who were arrested but Stand News posted a video on Facebook of police officers at the home of a deputy editor, Ronson Chan, to investigate the alleged crime. Chan is also chair of the Hong Kong Journalists Association.
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