(CNN) -  Did Yasser Arafat die eight years ago of natural causes
or was the 75-year-old Palestinian leader poisoned, as his widow
believes?  That's the question forensic investigators from at
least three nations are trying to answer by testing samples
taken from Arafat's body, which was exhumed Tuesday and reburied
a short time later.  Tests are being performed on those samples
for the presence of polonium -- a toxic, radioactive element
found on some of his personal belongings earlier this year.  For
five decades, Arafat was the most prominent face of Palestinian
opposition to Israel, first as the head of the Palestine
Liberation Organization, which carried out attacks against
Israeli targets, and later as the head of the Palestinian
Authority.   "We had nothing to do with it," Israeli government
spokesman Mark Regev told CNN's Wolf Blitzer. "Those charges are
ludicrous and it's conspiracy theories which, as you know,
sometimes have legs of their own. But, as you know, there is no
truth in it whatsoever."  F