By A member of the public is escorted by police after light a smartphone light near Victoria Park, Hong Kong's former venue for the annual 1989 Tiananmen massacre vigil, on Sunday. Louise Delmotte/APBeijing-appointed authorities in Hong Kong have blocked the Tiananmen memorial for the last three years, citing public health grounds. Wong said an artist friend, Sanmu Chen, had been detained along with others while attempting to stage a public street performance in Causeway Bay in Hong Kong