According to Human Rights Watch: "authorities investigating the disappearances of Isaías Uribe Hernández and Juan Pablo Alvarado Oliveros made a series of errors, including: failing to promptly secure the crime scene, which allowed crucial evidence to be damaged and removed; refusing to open a prompt investigation into the crime; passing the case back and forth between state and federal prosecutors; misplacing key evidence; failing to conduct adequate forensic analysis; and, in one instance, even lying about having conducted an interview or at least mistaking the identity of an interviewee in official records. Uribe Hernández and Alvarado Oliveros, both age 30, worked at the same veterinary clinic in Torreón, Coahuila. On April 4, 2009, they went out in Alvarado Oliveros’s pick-up truck—which bore the name of the clinic where they worked—at approximately 10:30 p.m., according to Uribe Hernández’s wife. They stopped by the home of Alvarado Oliveros’s friend, Leopoldo Gerardo Villa Sifuentes, to invite him to drinks, but he said he was staying in for the night with his family, according to testimony Villa Sifuentes later gave to state prosecutors. At approximately 2:30 am, Villa Sifuentes heard gunshots outside of his home. Five to ten minutes later, after the shooting stopped, he said, “I leaned out the window and realized that there were numerous soldiers wearing masks walking around the street, and I say that they were soldiers because they were traveling in trucks that were military green and carrying guns three times the size of normal ones…and when one of the masked soldiers spotted me he pointed his flashlight at my face and told me to go inside.” ^[+]