Hong Kong shocked by violent police arrest of 12-year-old girl

Child's mother says her daughter was buying art supplies when she was tackled and pinned to the ground by police

Hong Kong police have been strongly criticised over the rough arrest of a 12-year-old girl whose family says was caught in a protest crowd while out buying art supplies.

Video widely shared across social media and in Hong Kong media showed the officers seeking to corral a group of people including the young girl, who ducked aside and tried to run away. An officer tackled her to the ground, while several others helped to pin her down.