Israeli soldiers take up position during clashes with Palestinian stone-throwers at the Qalandiya checkpoint, near the West Bank city of Ramallah March 16, 2010. Palestinians mounted violent protests in Jerusalem on Tuesday and President Barack Obama’s Middle East envoy cancelled plans to return to the region as a U.S.-Israeli crisis over Jewish settlement plans deepened. REUTERS/Abed Omar Qusini (WEST BANK – Tags: CIVIL UNREST MILITARY POLITICS)