Seems a bit intentional:

General Cortés Vargas, who commanded the troops during the massacre, took responsibility for 47 casualties. In reality, the exact number of casualties has never been confirmed. Herrera Soto, co-author of a comprehensive and detailed study of the 1928 strike, has put together various estimates given by contemporaries and historians, ranging from 47 to as high as 2,000.[1] According to Congressman Jorge Eliécer Gaitán, the killed strikers were thrown into the sea.[1] Other sources claim that the bodies were buried in mass graves.[2]