< ! -- Deleted image removed : On December 6 , 1989 , at 7:30 AM , the Medellín Cartel detonated a bus loaded with of explosives directly in front of the headquarters building in downtown Bogotá . The explosion left 49 dead , 600 wounded and hundreds of retail outlets completely destroyed . It is considered to be the second worst terrorist act in the history of Colombia after the bombing of Avianca Flight 203 . It was also the second time the cartel attempted to kill DAS director Miguel Maza Márquez using an explosive device ; the first attack on May 30 , 1989 , left four dead and 37 wounded
Avianca Flight 203
Avianca Flight 203
Administrative Department of Security