The African Union (AU) has warned Burundi against moves to jeopardise peace efforts after an international arrest warrant was issued for ex-leader Pierre Buyoya and 16 other officials.
They are accused of being behind the 1993 assassination of the country’s first elected Hutu president.
The killing of Melchior Ndadaye triggered a brutal ethnic civil war.
There are fears that targeting Mr Buyoya, an ethnic Tutsi based in Mali, could reignite tensions.
More than 300,000 people died in a 12-year civil war between the minority Tutsi-dominated army and mainly Hutu rebel groups.