Caroline Anning from the charity Save the Children has warned the situation in South Sudan is similar to the east African famines in the 1980s.
Speaking to ITV News' Dan Rivers she said: "If it continues and we can't get the help we need, we could be looking at a catastrophic famine."
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Thousands of protesters have swarmed into the US capital and cities across the world to march for gun control.
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Cloudy and damp across much of England and Wales, although the rain should turn lighter and more patchy by the afternoon.