Kurdish militants in Turkey have issued a new call to arms to defend a border town in northern Syria from advancing Islamic State (IS) fighters, and the Turkish authorities and United Nations prepared for a surge in refugees. About 70,000 Syrian Kurds have fled into Turkey since Friday as IS militants seized dozens of villages close to the border and advanced on the frontier town of Ayn al-Arab, known as Kobani in Kurdish. Carol Batchelor, the United Nations refugee agency's (UNHCR) representative...