In 60 secs: South Sudan famine warning
The rainy season is approaching in South Sudan - and ongoing conflict in the world's newest country could take a heavy toll.
Four million people - more than a third of the population - are likely to face critical food shortages next month unless they receive urgent aid, British aid agencies warn.
BBC News looks at what that means - in 60 seconds.
Video produced by Michael Hirst, with footage and photographs from Oxfam, AP and AFP