I saw a silver disk shape flying object, it was still like a helicopter but it flue (sic. Flew) in a vertical dirección in a speed that I never saw before, with out making a sound, it was still on top of a mountain call "Loma de quita espuela"((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))((NUFORC Note: Witness indicates that the date of the sighting is approximate. PD))