Internal Security was the responsibility of the Hong Kong Government, in particular the Royal Hong Kong Police. It was supported by British Forces in Hong Kong should it be called upon to do so. During the Hong Kong 1967 riots, in which 51 people were killed, the British garrison supported the Royal Hong Kong Police in quelling the disturbance. Until 1995, the safety of much of the Sino-Hong Kong border was the responsibility of the British forces and as such contributed greatly to the interdiction of illegal immigrants (II). As the preparation of the handover of Hong Kong to China in 1997, that responsibility was passed on to the Hong Kong Police.