- 1915 26 Apr In the secret Treaty of London, Italy agrees to abandon its allies Germany and Austro-Hungary.
- 1937 26 Apr The Basque town of Guernica is destroyed by German bombers supporting Franco in the Spanish Civil War.
- 1986 26 Apr An explosion at a nuclear power plant in Chernobyl, Ukraine, causes the world's worst nuclear accident.
World War One Centenary
- Find out more about how the BBC is covering the World War One Centenary, and see the latest programmes and online content
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