Yasser Arafat 'Was Murdered With Polonium'
A team of experts have been examining samples taken from Mr Arafat's body since his grave was opened in the West Bank city of Ramallah last November.
The exhumation came eight years after his death at a military hospital in a suburb of Paris, France.
A post mortem revealed he died from a massive stroke but doctors said they were unable to find the origin of his illness.
French prosecutors opened a murder investigation in August 2012, after traces of polonium-210 - the same radioactive substance that killed Russian spy Alexander Litvinkenko in 2006 - were reportedly found on some of Mr Arafat's belongings.
Professor David Barclay, a British forensic scientist who has seen the results of the Swiss tests, said the findings were a "smoking gun" for those who suspect he was murdered.
"In my opinion, it is absolutely certain that the cause of his illness was polonium poisoning," he said. "The levels present in him are sufficient to have caused death."
Professor Barclay said a miniscule dose of the deadly isotope may have been slipped into Mr Arafat's drink, food, eye drops or toothpaste.
The substance must have been made in a nuclear reactor, he claimed.
Mrs Arafat did not accuse any country or person for her husband's death and acknowledged that he had many enemies.
Many Palestinians have pointed the figure at Israel, although the Israeli government has denied any role in his death, noting that he was 75 years old and had an unhealthy lifestyle.
Some experts have also questioned whether Mr Arafat could have died of polonium poisoning, given that he did not lose all his hair and made a brief recovery during his illness.
NWN: Do we need 3 guessses as to the culprits ? Or maybe only the 1 guess?