Hundreds of black-clad demonstrators took to the streets of Hong Kong again on Saturday and within the hour petrol bombs had been thrown into a metro station.Firebombs were thrown into Kowloon Tong MTR station at about 3pm, seriously damaging facilities, police said in a government statement, warning “rioters” to stop all illegal activities. No one was injured.Marchers, who were protesting against a new anti-mask law, had gathered at the Clock Tower outside the Hong Kong Cultural Centre in Tsim…