Hong Kong's most vocal pro-democracy newspaper, Apple Daily, printed its last edition on Thursday after a stormy year in which its tycoon owner and other staff were arrested under a new national security law, and its assets were frozen.

The closure of the popular tabloid, which mixes pro-democracy views with celebrity gossip and investigations of those in power, marks the end of an era for media freedom in the Chinese-ruled city, critics say.

"Thank you to all readers, subscribers, ad clients and Hong Kongers for 26 years of immense love and support. Here we say goodbye, take care of yourselves," the paper said in an online article.