Widow: Yasser Arafat 'had many enemies'
7 November 2013 Last updated at 18:45 GMT
Yasser Arafat's widow, Suha, has said that her late husband had "a lot of enemies all over the world", so she would not "jump to conclusions" and accuse anyone specific of causing his death.
Swiss scientists have confirmed that the late Palestinian leader had high levels of radioactive polonium in his body when he died.
However, they could not say whether polonium poisoning had caused his death in 2004.
Many Palestinians have long believed that Israel poisoned Arafat but Jerusalem has consistently denied any involvement.