Africa Weekly: a round-up of news and features in Africa

This week, as Nigeria marks two years since more than 200 schoolgirls were kidnapped by the Islamist militant group Boko Haram, we go to Chibok to see what's left of the school they used to go to. We take you to the Central African Republic where a population under threat from LRA militias are using radio waves to alert authorities of attacks, and we join a training camp for refugee athletes in Kenya who have their sights set on this summer's Rio Olympics. FOR SUBSCRIBERS OF AFRICA WEEKLY ONLY