President Jacob Zuma has confirmed that US President Barack Obama's forthcoming visit to South Africa will go ahead despite Nelson Mandela's poor health.
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Hundreds of pupils from Alperton Community School in Brent, London,cheered and waved flags as Andria Zafirakou arrived holding the prize.
The Novichok incident in Salisbury has turned into an international diplomatic crisis. But how bad could things get? Adam Shaw reports.
Among those murdered was Keith Palmer, an unarmed constable who "did his job and never wanted any fuss."