Hanan Ashrawi, who was close to Yasser Arafat and saw him shortly before he left for Paris has said that his illness looked "unnatural."
She said: "I talked to the medical teams that were examining him, they told me that unquestionably that he was poisoned, but they couldn't identify the poison."
Ms Ashrawi said that "we have to pursue now the people that are responsible justice has to be done."
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Temperatures will be on the rise in the next few days, with highs of 25C in the sunshine by Thursday, but do not expect clear blue skies.