Hong Kong's national security police arrest three, as Beijing issues warning to 'anti-China and pro-chaos elements'.

Police on Saturday detained one person who was part of a group that launched a petition demanding accountability

Police on Saturday detained one person who was part of a group that launched a petition demanding government accountability.

Police on Saturday detained one person who was part of a group that launched a petition demanding government accountability, two sources familiar with the matter said.

Authorities face growing criticism for detaining at least two civilians who have called for accountability

Hong Kong's national security police arrest three, as Beijing issues warning to 'anti-China and pro-chaos elements'.