Updated 16 December: The search has been deactivated, police say, because the teenager has been found alive and well.
Original post 15 December: Xerach Facto Alberto is 16 years old and has gone missing from his home in Callao Salvaje. When last seen he was wearing the same trousers as can be seen in the poster, a NY cap, a light grey hoodie, green framed glasses and silver-grey Adidas trainers, and was carrying a black backpack. He is in need of medication and his mother is distraught at his disappearance. If anyone has any information please call the numbers on the poster or any police.