Swiss scientists have concluded Palestinian leader Yasser Arafat is likely to have died from polonium poisoning, according to a text of their findings published by Al-Jazeera television Wednesday.

The results of tests on Arafat’s remains “moderately support the proposition that the death was the consequence of poisoning with polonium-210,” said the 108-page analysis posted on Al-Jazeera’s website.

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“New toxicological and radio-toxicological investigations were performed, demonstrating unexpectedly high-levels of polonium-210 and lead-210 activity in many of the analysed specimens,” said the report penned by 10 experts at the Vaudois University Hospital Centre (CHUV).

The Palestinian official in charge of the investigation into Arafat’s death, Tawfiq Tirawi, said on Tuesday that he had received the findings of the Swiss laboratory, although he declined to disclose them.

Official Palestinian news agency WAFA said that a separate Russian team appointed by the Palestinian Authority also handed in its report on November 2.

Some 60 samples were taken from the remains of the late Palestinian leader in November last year for a probe into whether he was poisoned by polonium.

The samples were divided between the Swiss and Russian investigators and a French team carrying out a probe at the request of Arafat’s widow Suha.

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Arafat died in France on November 11 2004 at the age of 75, but doctors were unable to specify the cause of death. No autopsy was carried out at the time, in line with his widow’s request.

His remains were exhumed in November 2012 and samples taken, partly to investigate whether he had been poisoned — a suspicion that grew after the assassination of Russian ex-spy and Kremlin critic Alexander Litvinenko in 2006.

In an October report published by The Lancet, eight scientists working at the Institute of Radiation Physics and University Centre of Legal Medicine in Lausanne confirmed they found traces of polonium in separate tests on clothing used by Arafat which they said “support the possibility” he was poisoned.