The 1964 race riots in Singapore involved a series of communal race-based civil disturbances between the Malays and Chinese in Singapore following its merger with Malaysia in 1963, and were considered to be the "worst and most prolonged in Singapore's postwar history". The term is also used to refer specifically to two riots on 21 July 1964 and 2 September 1964, particularly the former, during which 23 people died and 454 others suffered severe injuries.