A U.N peacekeeper of the United Nations Interim Force in Lebanon (UNIFIL) on an armoured vehicle secures the area near the site of an explosion in the southern Lebanese town of Tair Harfa December 17, 2012. The big explosion rocked the southern Lebanese town of Tair Harfa on Monday, five km (three miles) from the border with Israel but there were no casualties, residents said. REUTERS/Ali Hashisho (LEBANON - Tags: POLITICS CIVIL UNREST)