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3/11 Madrid, Spain Train Bombings (2004) - The Black Vault
The 11 March 2004 Madrid train bombings (also known as 3/11 and in Spanish as 11-M) consisted of a series of coordinated bombings against the Cercanías (commuter train) system of Madrid, Spain on the morning of 11 March 2004 (three days before Spain's general elections), killing 191 people and wounding 1,800.