Pope appeals for urgent food aid to help famine-stricken South Sudan
Pope says millions of people, including many children, are being "condemned to death by hunger"
Britain pledges extra $250 million to fight famine in South Sudan, Somalia
UNICEF says nearly 1.4 million children are at imminent risk of death in South Sudan, Somalia, Nigeria and Yemen
Yemen launches polio vaccination drive amid fears disease could reappear
Polio remains endemic in only three countries - Afghanistan, Pakistan and Nigeria
South Sudan's Kiir promises safe access to starving civilians as famine bites
Nearly half of South Sudan's 11 million people will lack reliable access to affordable food by July
FACTBOX-World's major famines of the last 100 years
People are currently starving to death in four countries, and 20 million lives are at risk in the next six months
UN says 1.4 million children at imminent risk of death in famines
"We can still save many lives. We must not repeat the tragedy of the 2011 famine in the Horn of Africa"
Refugee claimants from U.S. strain Canada's border resources
As asylum seekers arrive with frostbite, Canada converts unused basement into processing center for refugees
Parts of South Sudan suffering famine - govt official
Impact of war, combined with high food prices, economic disruption and low agricultural production expected to make 4.9 million people "food insecure"
Military investigates after South Sudan villagers claim gang rape by soldiers - bishop
Anglican Bishop Paul Yogusuk said soldiers had attacked at least five women and girls a week ago following a deadly ambush on a military convoy