This week on Inside Africa...

(CNN) -- This week on Inside Africa: developments in some high-profile humanitarian crises around the continent. We'll examine efforts by the Kenyan government to get internally displaced Kenyans to go home; the combined impact of the global food crisis and surging violence in Somalia; and a surprising assault on Khartoum by rebels from Darfur.

Kenyan government urges displaced people to return home

In Kenya, the unity government is trying to restore normalcy following a spasm of political violence that broke out in the final days of last year. More than a thousand people were killed and about 300,000 people were forced to flee their homes. Now, the government is promising them extra security if they go back, but as David McKenzie reports, many of the displaced no longer trust their leaders.

U.N. warns the crisis in Somalia will worsen

Somalia is the scene of what has been called the worst humanitarian crisis in Africa. Now, the U.N. says it's about to get worse. Escalating violence and a global food crisis have combined to put much of the country on the brink of famine. Our partner network, ITN, recently sent a videographer to a clinic for malnourished children on the edge of Mogadishu. John Sparks filed this report using those images, and we must warn you, some viewers may find them distressing.

Crisis in Darfur deepens with surprise rebel attack on Khartoum

The conflict behind the humanitarian crisis in Darfur has taken a new, discouraging turn with a surprise rebel attack on Khartoum. The Sudanese government says its forces quickly routed the rebels -- but not before more than 200 people were killed. Security forces have since been rounding up political opponents, including Islamic political leader Hassan Turabi, a former associate of Osama Bin Laden and former backer of Sudanese president Omar al-Bashir. He is accused of aiding the rebels in their weekend offensive. As Richard Roth reports, prospects for ending this five-year-old conflict anytime soon appear rather dim.

U.S. ambassador to Zimbabwe speaks out as violence escalates

Violence inside Zimbabwe appears to be escalating ahead of a presidential run-off, and U.S. Ambassador to Zimbabwe James McGee says he has witnessed evidence of that first-hand. McGee was part of a convoy of diplomats and journalists that visited alleged torture centers and hospitals treating victims of recent post-election violence. The outing put the group at odds with Zimbabwean authorities: Police confronted them not once, but twice. Isha Sesay spoke to McGee about the ordeal and filed this report using exclusive CNN video.