Palestinian protesters use sling shots to hurl stones towards Israeli security forces during clashes following a protest Palestinian Prisoner's Day and against the expropriation of Palestinian land by Israel in the West Bank village of Kafr Qaddum, near the northern city of Nablus, April 17, 2015. The current number of Palestinians held in Israeli prisons is at least 6,200 and is the biggest for at least five years, according to figures from rights groups. Photo by Nedal Eshtayah