Palestinian carry pictures of late leader Yasser Arafat, right, late George Habash, center, founder of the radical Popular Front for the Liberation of Palestine and Palestinian President Mahmoud Abbas, left, as they march to the Sabra and Shatila mass graves in Beirut, Lebanon, Friday, Sept. 18, 2009. Palestinians in Lebanon observed the 27th anniversary of one of their darkest episodes _ the massacre in the Beirut camps of Sabra and Shatila by Israeli-backed Christian militiamen in which between 1,200 and 1,400 people died, by Lebanese Red Cross count.