An Israel border police officer fires tear gas at stone-throwing Palestinians during clashes at Hawara checkpoint near the West Bank city of Nablus February 21, 2013. Palestinian protesters have said they fear for the life of Samer al-Issawi, who has been on intermittent hunger strike for over 200 days, and three other hunger strikers jailed by Israel. Their cases have been at the centre of intensified clashes with Israeli soldiers throughout the Israeli-occupied West Bank in the past few weeks. REUTERS/Abed Omar Qusini (WEST BANK - Tags: POLITICS CIVIL UNREST)