A Palestinian ministerial inquiry into the death of former leader Yasser Arafat has proved inconclusive, said Prime Minister Ahmed Qurei.
Many Palestinians believe Arafat was poisoned
Mr Qurei said that the inquiry found that French and Palestinian doctors could not identify the disease that killed Mr Arafat.
The former Palestinian leader's death was not caused by germs, cancer, poisoning or Aids, said Mr Qurei.
Yasser Arafat died on 11 November 2004 at a French military hospital.
But Mr Qurei added that file on Yasser Arafat's death would not be closed as "there could be medical developments in the future that could determine the cause of his death."
Speculation on the cause of Mr Arafat's death has continued in the media with many Palestinians believing that he was poisoned by Israel.
The Israeli government has repeatedly denied any involvement in his death.
The Palestinian leader's wife, Suha, refused to allow an autopsy.
A report published by the New York Times newspaper last month said that Mr Arafat's medical records showed that he died from stroke that stemmed from an unknown condition.
But a book by two Israeli journalists claimed that Mr Arafat's death could have been the result of an infection, Aids or poisoning.