A protester (centre R) is detained by police during a rally against a new national security law in Hong Kong on July 1, 2020, on the 23rd anniversary of the city's handover from Britain to China. - Hong Kong police arrested more than 300 people on July 1 -- including nine under China's new national security law -- as thousands defied a ban on protests on the anniversary of the city's handover to China. LEHTIKUVA / AFP Anthony Wallace