Photo: Siyad Abdi Ar, 24, was 16 when gunmen in Somalia came to his house, led him to a tree and tied him there. Kenya 2012 © Robin Hammond.
For two days they beat and tortured him. His arms have been left permanently disabled and he cannot control his urine. His mother says that before the attack he was a normal teenager, but has not been the same since. She chains him to stop him from wandering away. They have been in Dadaab refugee camp for six months.