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Lebanon's defense minister has said Islamist militants entrenched in a Palestinian refugee camp must surrender or face further military action. The ultimatum followed three days of fierce fighting between the army and the Fatah al-Islam group. The army has laid siege to the Nahr al-Bared camp since the fighting erupted on Sunday, bombarding it with tank fire and artillery shells. At least eighty people have died with dozens more wounded. On Wednesday, an informal ceasefire enabled thousands of residents to flee the camp. Some headed for another Palestinian refugee camp nearby, while others traveled to the neighboring city of Tripoli. The International Committee of the Red Cross estimates between thirteen and fifteen thousand refugees have left Nahr al-Bared. The camp is home to thirty thousand people. The internal conflict is the bloodiest in Lebanon since the civil war ended 17 years ago.