FILE - In this May 31, 2002 file photo, Palestinian leader Yasser Arafat pauses during the weekly Muslim Friday prayers in his headquarters in the West Bank city of Ramallah. Al-Jazeera is reporting that a team of Swiss scientists has found moderate evidence that longtime Palestinian leader Arafat died of poisoning. The Arab satellite channel published a copy of what it said was the scientists' report on its website on Wednesday, Nov. 6, 2013.(AP Photo/Lefteris Pitarakis, File)
FILE - In this May 31, 2002 file photo, Palestinian leader Yasser Arafat pauses during the weekly Muslim Friday prayers in his headquarters in the West Bank city of Ramallah. Al-Jazeera is reporting that a team of Swiss scientists has found moderate evidence that longtime Palestinian leader Arafat died of poisoning. The Arab satellite channel published a copy of what it said was the scientists' report on its website on Wednesday, Nov. 6, 2013.(AP Photo/Lefteris Pitarakis, File)
Swiss professor Francois Bochud, left, director of the Chuv Radiophysics Institute, IRA, and Swiss professor Patrice Mangin, right, director of the University Center of Legal Medicine in Lausanne, CURML, speak on a forensics report concerning the late President Yasser Arafat during a press conference at the Centre Hospitalier Universitaire Vaudois, CHUV, in Lausanne, Switzerland, Thurday, Nov. 7, 2013. Swiss, French and Russian teams took samples of the remains after exhuming Arafat's body in Ramallah, and submitted results to the Palestinian Authority on Nov. 5. (AP Photo/Keystone, Laurent Gillieron)
Swiss professor Francois Bochud, left, director of the Chuv Radiophysics Institute, IRA, and Swiss professor Patrice Mangin, right, director of the University Center of Legal Medicine in Lausanne, CURML, pose with a forensics report concerning the late President Yasser Arafat during a press conference on of the Centre Hospitalier Universitaire Vaudois, CHUV, in Lausanne, Switzerland, Thurday, Nov. 7, 2013. Swiss, French and Russian teams took samples of the remains after exhuming Arafat's body in Ramallah, and submitted results to the Palestinian Authority on Nov. 5. (AP Photo/Keystone, Laurent Gillieron)
A forensics report concerning the late President Yasser Arafat is presented during a press conference of the Centre Hospitalier Universitaire Vaudois, CHUV, in Lausanne, Switzerland, Thurday, Nov. 7, 2013. Swiss, French and Russian teams took samples of the remains after exhuming Arafat's body in Ramallah, and submitted results to the Palestinian Authority on Nov. 5. (AP Photo/Keystone, Laurent Gillieron)
Palestinian Hanadi Kharma, paints a mural depicting the late Palestinian leader Yasser Arafat in the West Bank city of Nablus, Thursday, Nov. 7, 2013. Swiss scientists have found evidence suggesting Yasser Arafat may have been poisoned with a radioactive substance, a TV station reported on Wednesday, prompting new allegations by his widow that the Palestinian leader was the victim of a "shocking" crime. (AP Photo/Nasser Ishtayeh)
RAMALLAH, West Bank (AP) — Yasser Arafat's mysterious 2004 death turned into a whodunit Thursday after Swiss scientists who examined his remains said the Palestinian leader was probably poisoned with radioactive polonium.
Yet hard proof remains elusive, and nine years on, tracking down anyone who might have slipped minuscule amounts of the lethal substance into Arafat's food or drink could be difficult.
A new investigation could also prove embarrassing — and not just for Israel, which the Palestinians have long accused of poisoning their leader and which has denied any role.
The Palestinians themselves could come under renewed scrutiny, since Arafat was holed up in his Israeli-besieged West Bank compound in the months before his death, surrounded by advisers, staff and bodyguards.
Arafat died at a French military hospital on Nov. 11, 2004, at age 75, a month after suddenly falling violently ill at his compound. At the time, French doctors said he died of a stroke and had a blood-clotting problem, but records were inconclusive about what caused that condition.
The Swiss scientists said that they found elevated traces of polonium-210 and lead in Arafat's remains that could not have occurred naturally, and that the timeframe of Arafat's illness and death was consistent with poisoning from ingesting polonium.
"Our results reasonably support the poisoning theory," Francois Bochud, director of Switzerland's Institute of Radiation Physics, which carried out the investigation, said at a news conference.
Bochud and Patrice Mangin, director of the Lausanne University Hospital's forensics center, said they tested and ruled out innocent explanations, such as accidental poisoning.
"I think we can eliminate this possibility because, as you can imagine, you cannot find polonium everywhere. It's a very rare toxic substance," Mangin told The Associated Press.
Palestinian officials, including Arafat's successor, Palestinian President Mahmoud Abbas, had no comment on the substance of the report but promised a continued investigation.
The findings are certain to revive Palestinian allegations against Israel, a nuclear power. Polonium can be a byproduct of the chemical processing of uranium, but usually is made artificially in a nuclear reactor or a particle accelerator.
Arafat's widow, Suha, called on the Palestinian leadership to seek justice for her husband, saying, "It's clear this is a crime."
Speaking by phone from the Qatari capital Doha, she did not mention Israel but argued that only countries with nuclear capabilities have access to polonium.
Israel has repeatedly denied a role in Arafat's death and did so again Thursday. Paul Hirschson, a Foreign Ministry official, dismissed the claim as "hogwash."
"We couldn't be bothered to" kill him, Hirschson said. "If anyone remembers the political reality at the time, Arafat was completely isolated. His own people were barely speaking to him. There's no logical reason for Israel to have wanted to do something like this."
In his final years, Arafat was being accused by Israel and the U.S. of condoning and even encouraging Palestinian attacks against Israelis instead of working for a peace deal. In late 2004, Israeli tanks no longer surrounded his compound, but Arafat was afraid to leave for fear of not being allowed to return.
Shortly after his death, the Palestinians launched their own investigation, questioning dozens of people in Arafat's compound, including staff, bodyguards and officials, but no suspects emerged.
Security around Arafat was easily breached toward the end of his life. Aides have described him as impulsive, unable to resist tasting gifts of chocolate or trying out medicines brought by visitors from abroad.
The investigation was dormant until the satellite TV station Al-Jazeera persuaded Arafat's widow last year to hand over a bag with her husband's underwear, headscarves and other belongings. After finding traces of polonium in biological stains on the clothing, investigators dug up his grave in his Ramallah compound earlier this year to take bone and soil samples.
Investigators noted Thursday that they could not account for the chain of custody of the items that were in the bag, leaving open the possibility of tampering.
However, the latest findings are largely based on Arafat's remains and burial soil, and in this case, tampering appears highly improbable, Bochud said.
"I think this can really be ruled out because it was really difficult to access the body," he said. "When we opened the tomb, we were all together."
Polonium-210 is the same substance that killed KGB agent-turned-Kremlin critic Alexander Litvinenko in London in 2006.
"It's quite difficult to understand why (Arafat) might have had any polonium, if he was just in his headquarters in Ramallah," said Alastair Hay, a professor of environmental toxicology at the University of Leeds who was not involved in the investigation.
"He wasn't somebody who was moving in and out of atomic energy plants or dealing with radioactive isotopes."
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John Heilprin reported from Lausanne, Switzerland. Associated Press writers Daniel Estrin in Jerusalem and Lori Hinnant in Paris and AP Medical Writer Maria Cheng in London contributed to this report.
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