JERUSALEM  — The discovery of traces of a radioactive agent on clothing reportedly worn by Yasser Arafat in his final days reignited a cauldron of conspiracy theories Wednesday about the mysterious death of the longtime Palestinian leader.

Arafat's widow, who ordered the tests by a Swiss lab, called for her husband's body to be exhumed, and Arafat's successor gave tentative approval for an autopsy. But experts warned that even after the detection of polonium-210, getting answers on the cause of death will be tough.

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