Stéphanie Braquehais

The Somali neighbourhood of Kenya's Nairobi has been targeted several times in recent months by terrorists. The police accuse sympathisers of the Islamic insurgents Al Shabaab of being behind the attacks. After several explosions, riots rocked the suburb as Kenyans and ethnic Somalis fought each other. A heavy police presence on the streets has brought calm to the area, but they are also accused by residents of attacking residents themselves.

A fugitive policeman has accused DR Congo's former police chief of ordering the assassination of a human rights activist. Paul Mwilambwe says he witnessed Floribert Chebeya being suffocated by colleagues in early June 2010 and accuses then chief of police, General John Numbi, of giving the order. Mwilambwe is one of four police officers to have been sentenced to death for the murder but he alleges that it was in fact the General behind the killing, acting on President Joseph Kabila's orders.

Last July, the world's youngest country, South Sudan, peacefully seceded from Sudan. Today, women and children are being killed and thousands of cattle stolen as the new country falls prey to inter-ethnic violence. In December, between 6,000 and 8,000 fighters from one ethnic group attacked another, in a brutal escalation of tit-for-tat attacks.

Hundreds of Sudanese have been forced to live in caves in a bid to escape a bombing campaign by the military. Amnesty and Human Rights Watch accuse the government of indiscriminately bombing rebel-held areas in oil-rich South Kordofan state. Our correspondents visited a cave complex high up in the Nuba Mountains, where they found women, children and the elderly seeking shelter. This is their exclusive report.