A French official says criminal investigators from France will exhume Yasir Arafat’s remains next month to try to find out how the Palestinian leader died. A separate Swiss investigative team will arrive in the West Bank city of Ramallah at the same time. The push to re-examine Mr. Arafat’s 2004 death came after a Swiss lab recently discovered traces of polonium 210, a deadly radioactive isotope, on clothes said to be his. The discovery revived suspicions of poisoning.