sentences:  After the death of Pablo Escobar on December 2, 1993, by a special unit of the National Police of Colombia, the Medellín Cartel went through an organizational crisis and the "sicarios" formed gun groups in the barrios.They began to dispute urban territories.The situation worsened when Colombian guerrillas infiltrated the cities trying to bring their war, traditionally in the countrysides, to the main urban centers.