Russia's report on the cause of Arafat's death produced inconclusive results and has added to the mix of reports and conjecture trying to understand what happened to the Fatah leader.
Four investigations, hundreds of testimonies and stacks of medical reports on Yasser Arafat's unexplained death in 2004 have failed to produce hard evidence of what killed him — and findings presented Friday only created more confusion.
Palestinian officials said a report they received from Russia on the role of radioactive polonium in Arafat's death was inconclusive.
...
Bashir, the Palestinian physician, said the Russian team sent its findings to the Palestinian Authority several days ago and the full report would be made public at a later time.
Bashir said that the Russian scientists did not find enough evidence to determine that polonium-210 "caused the acute radiation syndrome leading to death."
If there was intent to introduce the toxin into Arafat's system and not some other cause then I believe Hamas is as likely a candidate as any other party for responsibility.
After all, Hamas is not known for its adherence to a legal system when it comes to their treatment of Palestinians.
A regime which employs such tactics against their political opponents must be part of any serious discussion on assignment of potential responsibility.