The United Nations said on Monday it was worried about the possibility of rising tensions on the Lebanese-Israeli border after Hizbollah sent a surveillance drone over Israel, and urged Beirut to control its side.Israel withdrew from southern Lebanon in 2000 after a 22-year occupation and pressure from Hizbollah guerrillas, but there have been sporadic clashes in the region and Israeli breaches of Lebanese airspace, drawing anti-aircraft fire. On Sunday, Hizbollah said it had sent its first surveillance drone into Israel and promised more flights would follow. Israel’s military said the craft was an Iranian unmanned vehicle operated by Hizbollah.Full Story