Hundreds of Hong Kong national security police raided the office of online pro-democracy media outlet Stand News on Wednesday and arrested six people, including senior staff, for suspected ¡°seditious publications¡± offenses.

Stand News, set up in 2014 as a non-profit, is the most prominent remaining pro-democracy publication in Hong Kong after a national security probe earlier this year led to the closure of jailed tycoon Jimmy Lai¡¯s iconic Apple Daily tabloid.

The raid further raises concerns about media freedoms in the former British colony, which returned to Chinese rule in 1997 with the promise a wide range of individual rights would be protected.