Mary Harper Africa editor, BBC World Service
Prosecutors in the Central African Republic have launched an investigation into former President François Bozizé, accusing him of acts of destabilisation and rebellion.
Last month, the government accused him of staging an attempted coup as a coalition of rebels marched on the capital, Bangui, ahead of a general election.
Mr Bozizé, who was barred from standing in the 27 December poll, denied the allegations but said he supported the rebels.
The United Nations force in the CAR says the rebel advance has been halted.
On Sunday, militias seized the key border town of Bangassou causing thousands of civilians to flee.