A writer at the now-defunct Hong Kong pro-democracy newspaper Apple Daily was arrested at the airport on Sunday while attempting to leave the city, according to local media reports.

Editorial writer Fung Wai-kong was arrested on suspicion of foreign collusion to endanger national security, according to local newspaper the South China Morning Post and online news outlet Citizen News.

Mr Fung was believed to be leaving for Britain when he was arrested, local media said.

Police said they arrested a 57-year-old man at the airport on Sunday night under the national security law, but did not identify him.

He is the seventh Apple Daily executive to be arrested in two weeks, as Hong Kong authorities crack down on dissent in the semi-autonomous city, arresting most of its prominent pro-democracy figures and revamping Hong Kong’s election laws to keep opposition voices out of the legislature.

The Hong Kong Journalists Association (HKJA) condemned the police for targeting journalists.

“The HKJA reiterates that freedom of speech and freedom of the press are core values ​​of Hong Kong,” it said in a statement.

“If even the writing of the literati cannot be tolerated, it will be difficult for Hong Kong to be regarded as an international city.”

Mr Fung’s arrest also comes as pro-democracy online news outlet Stand News said in a statement that it would remove commentaries published on its site before June and halt its fundraising efforts because of concerns over the sweeping national security law.

The measures were taken to protect the news outlet’s supporters, writers and editorial staffers in the “literary inquisition” of Hong Kong, Stand News said in a statement.

Despite the precautionary measures taken, Stand News pledged to keep reporting the news.

“In the past six-and-a-half years, the Stand News team has been through trials and hardships with the people of Hong Kong, cherishing each other and weaving the common memory of Hong Kong’s survival,” it said in a statement.

“To pass on these memories, we will stick to our posts, walk with the people of Hong Kong … and write and record the news and happenings in Hong Kong.”

The online news platform also said it would stop taking money from subscribers and donors and stop accepting new subscriptions to prevent the risk of money going to waste. Under the national security law, assets can be frozen if authorities believe the money is linked to a related crime.

Earlier this month, authorities froze 2.3 million US dollars (£1.7 million) worth of assets linked to the Apple Daily newspaper.

Last week, Apple Daily printed its final edition and ceased operations, citing employee safety and an inability to pay wages.