Armero

The Armero tragedy (Spanish: Tragedia de Armero) was one of the major consequences of the eruption of the Nevado del Ruiz stratovolcano in Tolima, Colombia on November 13, 1985. After 69 years of dormancy, the volcano's eruption caught nearby towns unaware, even though the government had received warnings to evacuate the area from multiple volcanological organizations when volcanic activity had been detected in September 1985.

• http://en.wikipedia.org/wiki/Armero tragedy