Prime Minister David Cameron said the UK must lead the fight against hunger ahead of next week's G8 summit.
Mr Cameron said, "One billion still go hungry. It's right that as Britain hosts the G8, we lead from the front and help beat hunger".
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The major party leaders' campaigns for the General Election will remain suspended on Wednesday following the Manchester terror attack.
Thousands of people have donated to help the families of the victims - as well as a homeless man who came to their aid.
Some children, particularly those who have been more directly affected, may show symptoms of stress and trauma.