RAMALLAH: Israel is the only suspect in the 2004 death of Yasser Arafat, the chief Palestinian investigator in the case alleged Friday, a day after Swiss scientists said the Palestinian leader was probably poisoned by radioactive polonium.

The investigator, Tawfik Tirawi, said the probe would continue, but did not say what more the Palestinians could do to try to solve the mystery.

He did not present evidence of Israeli involvement, arguing only that Israel had the means and motive to do so.

Arafat’s widow, Suha, has called on the Palestinians to seek an international investigation or legal action, but Tirawi said such a decision is up to the Palestinian leadership. Arafat’s successor, President Mahmoud Abbas, has so far not commented on the substance of the Swiss team’s findings.

At Friday’s news conference, Palestinian investigators summarized the findings of the Russian experts, whom Abbas had asked for a separate probe.

“The outcome of the comprehensive report on the levels of Polonium-210 and the development of his illness does not give sufficient evidence to support the decision that Polonium-210 caused acute radiation syndrome leading to death,” said Dr. Abdullah Bashir, the medical expert on the Palestinian team, quoting the conclusions of the Russian report.

At another point, Tirawi described Israel as the “first, fundamental and only suspect in the assassination of Yasser Arafat.”