A worker emerges from one of hundreds of smuggling tunnels that connect the Gaza Strip and Egypt. Paolo Pellegrin/National Geographic hide caption

itoggle caption Paolo Pellegrin/National Geographic

The Israelis and Palestinians have clashed repeatedly over the Gaza Strip, but the recent upheavals in the Middle East have changed the dynamics this time. Here, a Palestinian woman is helped after being injured in an Israeli strike in Gaza City on Monday. Bernat Armangue/AP hide caption

itoggle caption Bernat Armangue/AP

Palestinian militants fire a rocket from the northern Gaza Strip toward southern Israel on Thursday. For the past decade, Palestinians in Gaza have been shooting short-range rockets into southern Israel. But Palestinians fired a much longer range rocket that landed just outside Jerusalem on Friday, a move seen as a major escalation. Oliver Weiken/EPA /LANDOV hide caption

itoggle caption Oliver Weiken/EPA /LANDOV

Palestinians try to extinguish fire following an Israeli air strike on Wednesday in Gaza City. Mohammed Abed /AFP/Getty Images hide caption

itoggle caption Mohammed Abed /AFP/Getty Images

Palestinian Authority head Mahmoud Abbas delivers a speech in Cairo on May 4, 2011 during a Palestinian unity ceremony. THAER GHANEM/AFP/Getty Images hide caption

itoggle caption THAER GHANEM/AFP/Getty Images