MOGADISHU, Somalia – A 13-year-old girl who said she had been raped was stoned to death in Somalia after being accused of adultery by Islamic militants, a human rights group said.

Dozens of men stoned Aisha Ibrahim Duhulow to death Oct. 27 in a stadium packed with 1,000 spectators in the southern port city of Kismayo, Amnesty International and Somali media reported, citing witnesses. The Islamic militia in charge of Kismayo had accused her of adultery after she reported that three men had raped her, the rights group said.

Initial local media reports said Duhulow was 23, but her father told Amnesty International she was 13. Some of the Somali journalists who first reported the killing later told Amnesty International that they had reported she was 23 based upon her physical appearance.

"This child suffered a horrendous death at the behest of the armed opposition groups who currently control Kismayo," David Copeman, Amnesty International's Somalia campaigner, said in a statement Friday.