Thousands of people in Tanzania have been taking part in an exercise aimed at identifying those behind the killing of albinos for ritual purposes

The process - in which people fill in forms anonymously, naming those they suspect of involvement - was ordered by President Jakaya Kikwete. But some fear the nationwide exercise, which has begun in the Lake Zone area, could be used for personal vendettas. Witchdoctors reportedly buy albino body parts to make "magic" potions. Since late 2007, 45 albinos have been slaughtered in Tanzania. Forty-four of the killings have taken place in the Lake Zone district. Police believe the killers are selling their victims' limbs, hair, skin and genitals to traditional medicine practitioners who make potions promising to make people wealthy.