Hong Kong media tycoon, Jimmy Lai, has been detained, one of seven people arrested under the new, Beijing-imposed national security law. Lai is the most high-profile individual arrested yet under the new law. An executive in Lai's media group says he was arrested on suspicion of "colluding with foreign powers"; he had already been facing multiple charges for his role in the city's pro-democracy movement. The police also raided the offices of Lai's newspaper. Al Jazeera's Sarah Clarke reports live from Hong Kong. Subscribe to our channel: http://aje.io/AJSubscribe Follow us on Twitter: / ajenglish Find us on Facebook: / aljazeera Check our website: https://www.aljazeera.com/ #HongKong #JimmyLai #HongKongSecurityLaw