(BBC) – The International Criminal Court (ICC) in The Hague has rejected an appeal by the Congolese militia leader, Thomas Lubanga, against his conviction for using child soldiers. Prosecutors said boys as young as 11 had been abducted to fight in the conflict in the Democratic Republic of Congo that started in 1999. Girls were used as sex slaves, the trial heard. In 2012, Lubanga became the first person to be convicted by the ICC.