Norma relacionada
Practice Relating to Rule 10. Civilian Objects’ Loss of Protection from Attack
Section A. Civilian objects used for military purposes
Colombia’s Instructors’ Manual (1999) states: “Objects which are normally civilian can, depending on the military situation, be converted into military objectives (for example a house or a bridge used for tactical purposes by the defender and therefore liable to attack).” 
Colombia, Derechos Humanos & Derecho Internacional Humanitario – Manual de Instrucción de la Guía de Conducta para el Soldado e Infante de Marina, Ministerio de Defensa Nacional, Oficina de Derechos Humanos, Fuerzas Militares de Colombia, Santafé de Bogotá, 1999, p. 16.
The Report on the Practice of Colombia refers to a decision of the Council of State which considered that when civilian means of transportation are used by combatants they become military objectives. 
Report on the Practice of Colombia, 1998, Chapter 1.3, referring to Council of State, Administrative Case No. 7013, Judgment, 13 December 1993.