Sook Ching was a mass killing that occurred from 18 February to 4 March 1942 in Singapore after it fell to the Japanese. It was a systematic purge and massacre of 'anti-Japanese' elements in Singapore, with the Singaporean Chinese particularly targeted by the Japanese military during the occupation. However, Japanese soldiers engaged in indiscriminate killing, and did not try to identify who was 'anti-Japanese.' Singapore was a crucial strategic point in World War II. From 8 February to 15 February, the Japanese fought for control of the city. The combined British and Commonwealth forces surrendered in a stunning defeat to the outnumbered Japanese on 15 February which led to its fall. The loss of Singapore was and still is Britain's largest surrender in history.

The Kempeitai was the military police of the Imperial Japanese Army. The organization also shared civilian secret police, espionage, and counter-intelligence roles within Japan and its occupied territories, and was notorious for its brutality and role in suppressing dissent. The broad duties of the Kempeitai included maintaining military discipline, enforcing conscription laws, protecting vital military zones, and investigating crimes among soldiers. In occupied areas, it also issued travel permits, recruited labor, arrested resistance, requisitioned food and supplies, spread propaganda, and suppressed anti-Japanese sentiment. At its peak at the end of World War II, the Kempeitai was an extensive corps with about 35,000 personnel.