A still image taken from a video that the extremist group Boko Haram says is of more than 100 girls who were abducted from a Nigerian school last month. Rebel kidnappings of girls has become increasingly common in African conflicts.
U.N. Secretary-General Ban Ki-moon holds a child at a refugee camp in Juba, South Sudan, on Tuesday. There have been increased calls for a contingent of African troops to be involved in peacekeeping operations.
Kenyan security officers rounded up people Friday as part of a crackdown that has swept up thousands of undocumented refugees, immigrants and Kenyan citizens of Somali descent in recent weeks.
Tony Karumba/AFP/Getty Images