The Cali Explosion occurred on August 7, 1956, in downtown Cali, Colombia. It was caused by the explosion of seven army ammunition trucks loaded with 1053 boxes of dynamite, which were parked in Cali overnight. In 1956, the city of Cali had around 400,000 inhabitants. More than 1,300 died from the explosion, and another 4,000 were wounded. Some estimates go as high as 4,000 deaths and 12,000 injuries.