Hong Kong business tycoon Jimmy Lai has been arrested and his newspaper offices raided by police over allegations of collusion with foreign forces. His case is the most high-profile arrest so far under the controversial security law imposed by China in June. Mr Lai has been a prominent pro-democracy voice and a supporter of protests that erupted last year. In February the 71-year-old, who also holds UK citizenship, was charged with illegal assembly and intimidation. ... [This is mainly for current news and for learning English. So, for learning English and better understanding, the hard coded subtitles have also been added in this video.]