The rivals also express commitment to holding elections in efforts hailed by France as "historic".
Mozambique hit by new killings of children with albinism, paramedics "find foetus in bin" in South Africa, and more stories.
The Ethiopian government says only 15% of its citizens returned before today's amnesty deadline.
A selection of the best photos from Africa this week
Travelling from Africa along Europe's great migration route
The women who take dangerous pills to gain weight
The life and death of a South African HIV campaigner
Why are Ghanaians not more interested in science?
How French seafaring traditions are kept alive in Madagascar
An East African take on Sierra Leone's capital
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Meet the student giving care home residents bike rides