File images of Hong Kong police in 2021 raiding a museum that houses exhibits commemorating Beijing's 1989 deadly crackdown on Tiananmen Square. A day earlier they arrested four members of the group that ran the venue. Hong Kong's top court ruled in favour of three Tiananmen vigil organisers on March 6, quashing the activists' prison terms over their refusal to submit information to national security police. FILE IMAGES ++ SEE ALSO ARREST: V000_9ME7X9 ++ ++ ALSO SEE VIDI_9UK2RD PROFILE OF CHOW HANG-TUNG ++