Clashes Spread to City’s Metro System: Hong Kong Update

(Bloomberg) -- Hong Kong police fired tear gas, sprayed blue dye from water cannons and baton-charged demonstrators who had lobbed petrol bombs and built bonfires in one of the city’s most violent days in its 13th weekend of social unrest.Tens of thousands joined an unauthorized march following the arrest of several top opposition figures this week including Joshua Wong. The demonstrations began in June over a bill allowing extraditions to mainland China before morphing into a wider push a