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."
More top news
Nick Clegg has set out his final conditions for any coalition involving the Liberal Democrats, with increasing public sector pay a priority.
Floyd Mayweather preserved his unbeaten record with a unanimous points victory over Manny Pacquiao in their superfight
A group of nearly 300 Nigerian women and children rescued from Boko Haram extremists by the military have been brought to a refugee camp.