Lo Yan-wai is a veteran journalist in Hongkong and director of the documentary “Vanished Archives.” The documentary recalled the 1967 Riot in HK, which itself was the spill-over of China’s Cultural Revolution into HK. Over the course of four years, she interviewed the leftist rioters, bomb squad leaders, former British police officers and senior officials handling the riot, as well as journalists and students of the time. She beefed up the oral historical records with de-classified British archives as well as Notebook on 67 Riot compiled by senior Chinese official Wu Di-zhou who was then aiding Chinese Premier Zhou Enlai in handling the Riot.