A judge in Guinea has rejected a request from a former military ruler, Moussa Dadis Camara, that he be placed under house arrest rather than remain in prison during his trial for mass murder.

Captain Camara returned to the country last month after 12 years in exile.

He's on trial together with 10 other former officials over atrocities that took place in 2009 soon after he seized power.

He's charged with being responsible for the killing by soldiers of more than 150 people and the rape of more than 100 women at an opposition rally in a Conakry stadium.

Captain Camara has denied all the charges.