Nouakchott - Thirteen Mauritanian anti-slavery campaigners who are on trial for "rebellion and use of violence" told a court on Monday they had been tortured in custody, their lawyer said.
They were arrested last month after a protest in a Nouakchott slum community that was being forcibly relocated as the west African country prepared for an Arab League summit.
"One by one, the thirteen spoke out against the torture they had been subjected to in custody," said Brahim Ould Ebetty, representing the members of the Initiative for the Resurgence of the Abolitionist Movement.
The activists demanded that "proceedings be brought against the torturers they have mentioned by name," the lawyer added.
The thirteen are accused of rebellion, use of violence, attack against public authority, armed assembly and membership of an unrecognised organisation, which carries a potential fine and a jail term of up to two years.
The Nouakchott slum was home to many so-called Haratin - a "slave caste" under a hereditary system of servitude whose members are forced to work without pay as cattle herders and domestic servants.
About 10 police officers were injured during the protest, according to local officials.