The former President of Chad, Hissene Habre, has been detained again in Senegal, less than a day after being released from custody.
Hissene Habre's regime is accused of murders and torture
The interior ministry said he would be "placed at the disposition of the president of the African Union", Nigerian leader Olusegun Obasanjo.
Mr Habre is wanted in Belgium for abuses committed under his rule.
He had been freed on Friday after a court said it did not have the power to decide whether to extradite him.
Senegalese President Abdoulaye Wade has said he believed the case was a problem for Africans to address, and that he would raise it with the African Union.
Mr Habre - who ruled Chad between 1982 and 1990 - has lived in Senegal since he was ousted. He denies any knowledge of atrocities.
Human Rights Watch has called Mr Habre "Africa's Pinochet". His administration has been accused of murdering and torturing political opponents.
Alleged victims filed complaints under Belgium's universal jurisdiction law, which allows Brussels judges to prosecute human rights offences anywhere.