Two former senior editors arrested in a Hong Kong police crackdown on a pro-democracy media organisation were charged on Thursday with sedition-related offences, national security authorities said.

About 200 police raided the office of the Stand News online publication on Wednesday, froze its assets and arrested seven current and former senior editors and former board members.

The raid was the latest in a crackdown on the media and on dissent in general in the former British colony since China imposed a...