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Armed members of the al-Aqsa Martyrs Brigades, the Palestinian Fatah movement's armed wing, take part in a march to mark the 50th anniversary of the launching of Fatah's armed struggle against Israel on January 1, 2015 at Qalandia Palestinian refugee camp in the West Bank. Fatah was founded by the late Yasser Arafat and its anniversary commemorates the first operation against Israel claimed by its armed wing on January 1, 1965. AFP PHOTO/ABBAS MOMANI (Photo credit should read ABBAS MOMANI/AFP/Getty Images)

Armed members of the al-Aqsa Martyrs Brigades, the Palestinian Fatah movement's armed wing, take part in a march to mark the 50th anniversary of the launching of Fatah's armed struggle against Israel on January 1, 2015 at Qalandia Palestinian refugee camp in the West Bank. Fatah was founded by the late Yasser Arafat and its anniversary commemorates the first operation against Israel claimed by its armed wing on January 1, 1965. AFP PHOTO/ABBAS MOMANI        (Photo credit should read ABBAS MOMANI/AFP/Getty Images)