Police in Hong Kong arrested another top staffer at the now-closed pro-democracy tabloid Apple Daily on Wednesday.
Local media say its former executive editor-in-chief Lam Man-chung was taken in by the city's national security police.
Lam makes eight arrests tied to the newspaper, including founder Jimmy Lai.
In a statement, police said that they arrested a 51-year-old former newspaper editor on suspicion of “conspiring to collude with foreign countries or foreign forces to endanger national security."
Next Digital, which published Apple Daily, did not immediately respond to a request for comment.
The popular tabloid folded after several hundred police raided its headquarters last month and froze the company's assets and bank accounts.
Its last print edition was published one week after.
Police have said dozens of the paper’s articles may have violated the city's Beijing-imposed national security law, the first instance authorities have leveraged the legislation against local media.
Critics of the law say it’s been used to muzzle dissent and erode freedoms, but authorities have denied those claims, saying enforcement protects national security.