The number of children accused of witchcraft in parts of Africa is increasing significantly, with orphans, street children and disabled mostly at risk, Unicef has said.

A new Unicef report has warned that children accused of being witches - some as young as eight - have been been burned, beaten and even killed as punishment. Also, children have had petrol poured into their eyes or ears as a way of trying to exorcise "evil spirits" that healers believe have possessed them.