The Swiss investigators who detected enough polonium in the body of Yasser Arafat to kill him say there should be an inquiry into how the former Palestinian leader died.
Many Palestinians agree, but Israel has dismissed the idea as a conspiracy theory.
ITV News Middle East Correspondent Geraint Vincent reports.
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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.
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Among those murdered was Keith Palmer, an unarmed constable who "did his job and never wanted any fuss."