Al Jazeera reports: It was a scene that riveted the world for weeks: The ailing Yasser Arafat, first besieged by Israeli tanks in his Ramallah compound, then shuttled to Paris, where he spent his final days undergoing a barrage of medical tests in a French military hospital.

Eight years after his death, it remains a mystery exactly what killed the longtime Palestinian leader. Tests conducted in Paris found no obvious traces of poison in Arafat’s system. Rumors abound about what might have killed him – cancer, cirrhosis of the liver, even allegations that he was infected with HIV.

A nine-month investigation by Al Jazeera has revealed that none of those rumors were true: Arafat was in good health until he suddenly fell ill on October 12, 2004.

More importantly, tests reveal that Arafat’s final personal belongings – his clothes, his toothbrush, even his iconic kaffiyeh – contained abnormal levels of polonium, a rare, highly radioactive element. Those personal effects, which were analyzed at the Institut de Radiophysique in Lausanne, Switzerland, were variously stained with Arafat’s blood, sweat, saliva and urine. The tests carried out on those samples suggested that there was a high level of polonium inside his body when he died.

“I can confirm to you that we measured an unexplained, elevated amount of unsupported polonium-210 in the belongings of Mr. Arafat that contained stains of biological fluids,” said Dr. Francois Bochud, the director of the institute.

The institute studied Arafat’s personal effects, which his widow provided to Al Jazeera, the first time they had been examined by a laboratory. Doctors did not find any traces of common heavy metals or conventional poisons, so they turned their attention to more obscure elements, including polonium.

It is a highly radioactive element used, among other things, to power spacecraft. Marie Curie discovered it in 1898, and her daughter Irene was among the first people it killed: She died of leukemia several years after an accidental polonium exposure in her laboratory.

At least two people connected with Israel’s nuclear program also reportedly died after exposure to the element, according to the limited literature on the subject.

But polonium’s most famous victim was Alexander Litvinenko, the Russian spy-turned-dissident who died in London in 2006 after a lingering illness. A British inquiry found that he was poisoned with polonium slipped into his tea at a sushi restaurant. [Continue reading…]