1964 race riots in Singapore
The 1964 race riots in Singapore were a series of communal disturbances and racial conflicts between the Malay and Chinese communities in Singapore. They occurred just months after Singapore's merger with Malaysia on 16 September 1963 and were regarded as the most serious and prolonged racial violence in the nation's post-war history.
Source: Wikipedia — 1964 race riots in Singapore (CC BY-SA 4.0)