An aide says the Palestinian leader wants more information from a Swiss lab before deciding whether to dig up the remains of his predecessor, Yasser Arafat.

Doctors at the lab say they found elevated levels of the radioactive agent polonium-210 on clothing reportedly worn by Arafat before his death in November 2004.

The lab says the findings don't prove Arafat was poisoned. Experts are divided over whether an autopsy, sought by Arafat's widow, could clear up a lingering mystery surrounding the cause of Arafat's death.

Palestinian President Mahmoud Abbas has said he's willing to exhume the body. However, Abbas aide Nimr Hamad said Thursday the Palestinian leader first wants to send experts to Europe to learn more from the Swiss lab and to the French military hospital where Arafat died.