51 125(39) Subsequently, the paramilitary group abandoned the district and proceeded in the direction of the urban area of Ituango. Once there, they went to the Colombia Polytechnic Institute Jaime Isaza Cadavid, and seized the Institute’s Coordinator, Jairo de Jesús Sepúlveda Arias, aged 38 years. The following day, June 12, 1996, his body was found with four bullet holes in El Líbano, located on the highway leading from the Municipality of Ituango to Medellín. His parents were Abraham Sepúlveda and María Inés Arias. Jairo de Jesús Sepúlveda Arias was a teacher and lived with his mother. 125(40) Having perpetrated the said selective executions, the paramilitary group left the area of La Granja without encountering any opposition from law enforcement personnel. iv) Criminal investigations 125(41) Following the events in La Granja both the Police and also the Ituango Sectional Prosecutor’s Office and the Antioquia Office of the Attorney General opened a preliminary inquiry into the events in this municipal district. On June 12, 1996, a preliminary inquiry was opened into the death of Jairo de Jesús Sepúlveda Arias. On June 19, 1996, the measures taken in relation to the death of William de Jesús Villa García, Héctor Hernán Correa García and María Graciela Arboleda Rodríguez were joined to that preliminary inquiry. In view of the gravity of the facts and the complications relating to geography and public order, the investigation of the facts was transferred from the Prosecutor General’s Office to the National Human Rights Unit on November 20, 1996. 125(42) From November 1996 to mid-1999, the National Human Rights Unit conducted various investigatory procedures, including the reception of statements, judicial inspections, and a search for witnesses. 125(43) On June 17, 1999, three years after the massacre in La Granja, the National Human Rights Unit of the Prosecutor General’s Office issued a decision to open the pre-trial investigation. On that occasion, it ordered the investigation and a preventive measure consisting of pre-trial detention of the civilians Jaime and Francisco Angulo Osorio, who were detained in the context of other proceedings. However, the preventive measure against them was subsequently revoked. It also decided to investigate Hernando de Jesús Álvarez Gómez, Manuel Remigio Fonnegra Piedrahita and Carlos Castaño Gil, and ordered their arrest 125(44) On the same date, orders were given to investigate two State agents, the Commander of the Police in Ituango, José Vicente Castro, and the National Army Lieutenant and Commander of the Girardot Battalion based in Ituango, Jorge Alexander Sánchez Castro, for the crimes of co-authorship in the establishment of private justice groups, aggravated murder and aggravated simple kidnapping with criminal intent by unjustified omission. At the same time, an order was issued for the preventive detention of these State agents. 125(45) On June 2, 2000, orders were issued to investigate some members of the United Self-Defense Forces of Colombia (AUC) in the proceedings: the civilians, Jhon Jairo Mazo Pino, Lider Yamil Concha Rengifo, Gilberto Antonio Tamayo Rengifo and Jorge Alberto Muletón Montoya.