A Palestinian leftist waves his national flag during a sit-in held in front of the United Nations building in Beirut June 1, 2011. The rally was held to mourn the Palestinian demonstrators who were killed on May 15 during clashes with Israeli soldiers at Maroun al-Ras near the Israeli border in south Lebanon. REUTERS/ Jamal Saidi (LEBANON - Tags: CIVIL UNREST POLITICS IMAGES OF THE DAY)