Hong Kong national security law: 53 former opposition lawmakers, activists arrested; authorities accuse them of plot to ‘overthrow’ government

• Nearly 1,000 police officers conduct raids across city, detaining 53 people accused of organising or involvement in unofficial primary election last July
• Authorities say the ‘35-plus’ plan to take control of the 70-member legislature in now-postponed official elections ran afoul of the national security law