Palestinian investigators said on Friday that Israel is the "only suspect" in the death of president Yasser Arafat, after a new report suggested he died from polonium poisoning. "We say that Israel is the prime and only suspect in the case of Yasser Arafat's assassination, and we will continue to carry out a thorough investigation to find out and confirm all the details and all elements of the case," Palestinian committee head Tawfiq Tirawi told a news conference in the West Bank city of Ramallah.