Hong Kong police arrested the editor-in-chief and four other executives of pro-democracy newspaper Apple Daily on Thursday, on suspicion of violating the national security law.
Apple Daily is owned by media mogul Jimmy Lai, who was also arrested and jailed on a string of charges.
Apple Daily is known to be critical of Beijing’s leadership.
Dozens of prominent activists have been arrested since the national security law was introduced last year.
According to an SCMP report, police entered the office premises at around 07:00 local time on Thursday (23:00 GMT Wednesday).
They then separately visited the homes of editor-in-chief Ryan Law, parent company Next Digital’s CEO Cheung Kim-hung, COO Chow Tat-kuen, Apple Daily publisher Chan Pui-man and Director Cheung Chi-wai, and arrested them.
Police did not name those arrested but confirmed that the five people, aged between 47 and 63, were arrested for “collusion with a foreign country or with external elements to endanger national security”.
This is the second raid to take place in Apple Daily in under a year – a raid last August saw 10 people arrested including Mr Lai and his sons.