According to investigations from the time, Aranguren was not alone in the farm at the time of his death. He was accompanied by three accomplices: Alfonso "Pata de Chivo" Parra, Gustavo "Veneno" Ávila and Alberto "Peligro" López, all of whom were armed. Investigators determined that Aranguren carried with him a 7mm rifle with 96 cartridges and a long .38 caliber revolver with 7 cartridges; Ávila also had a rifle with 50 cartridges; Parra carried a Cristóbal Kiraly M2 Carbine with 423 bullets, and López with 1940-model rifle with 110 cartridges and a frag grenade imported from America.
