MTR's Ngau Tau Kok Station has been severely damaged by protesters in the early hours today.
Petrol bombs have been hurled at the Maxim's Cake Shop and the escalator.
Police arrived to investigate but no one was arrested.
The MTR Corp condemned the vandalism and said it will prosecute suspects.
At about 1:00 am, several people in black broke through to the lobby of Exit B2 of Ngau Tau Kok MTR Station and threw two petrol bombs at the Maxim's outlet. They also threw two petrol bombs at the escalator.