Central African Republic, two-thirds controlled by rebels, is "at grave risk" the UN envoy says.
Diary Sow, who raised concern by failing to return to school in Paris, had been "on a little break".
The trial of Israeli businessman Beny Steinmetz is seen as the biggest corruption case in mining.
Africa will have to wait "weeks if not months" before getting WHO-approved vaccines, officials say.
A selection of the week's best photos from across the continent and beyond.
When her friends died in childbirth, a Nigerian woman hatched a plan to make a difference.