Forensic results confirm the possibility that the late Palestinian leader Yasser Arafat had been poisoned, his widow Suha said Wednesday. Swiss scientists said they found at least 18 times the normal amount of polonium, a radioactive substance, in his remains.

"This has confirmed all our doubts," Suha said. ""It is scientifically proved that he didn't die a natural death and we have scientific proof that this man was killed."

The scientists said they were 83 percent confident in concluding that Arafat was poisoned. It was announced in 2012 that the former leader's remains would be exhumed, after traces of a radioactive substance were found on his clothing.

The report compiled by Lausanne University Hospital's Institute of Radiation Physic and obtained by Al-Jazeera, revealed that unnaturally high levels of polonium was found on the Palestinian leader’s ribs and pelvis, and in soil stained with his decaying organs.

READ MORE: Yasser Arafat’s Death May Cause More Anxiety And Hostility Between Israelis And Palestinians

Experts told Suha that the poison would have been put in his coffee, tea or water. He must have been poisoned by someone "in his close circle," she told Reuters.

His widow received a copy of the report on Tuesday. “When they came with the results, I’m mourning Yasser again,” she said. “It’s like you just told me he died.”

The Swiss team is one of three groups that were Arafat's remains at the request of his widow. The other teams are located in France and Russia. Their reports have not yet been made public.

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