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Ethnic riots mostly targeting the minority Sri Lankan Tamils broke out in Ceylon, resulting in at least 158 deaths over the next few days.

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1958 anti-Tamil pogrom
First islandwide Sinhalese-Tamil riots in Ceylon
The 1958 anti-Tamil pogrom and riots in Ceylon, also known as the 58 riots, refer to the first island-wide ethnic riots and pogrom to target the minority Tamils in the Dominion of Ceylon after it became an independent dominion from Britain in 1948. The riots lasted from 22 May…Source: Wikipedia (CC BY-SA)
Sri Lankan Tamils
South Asian ethnic group
Sri Lankan Tamils, also known as Ceylon Tamils or Eelam Tamils, are Tamils native to the South Asian island state of Sri Lanka. Today, they constitute a majority in the Northern Province, form the plurality in the Eastern Province and are in the minority throughout the rest of…Source: Wikipedia (CC BY-SA)
Dominion of Ceylon
Country in South Asia from 1948 to 1972
Ceylon was an independent country in the Commonwealth of Nations from 1948 to 1972, that shared a monarch with other dominions of the Commonwealth. In 1948, the British Colony of Ceylon was granted independence as Ceylon. In 1972, the country became a republic within the…Source: Wikipedia (CC BY-SA)