SURUC Turkey (Reuters) - Kurdish militants in Turkey have issued a new call to arms to defend a border town in northern Syria from advancing Islamic State fighters, and the Turkish authorities and United Nations prepared on Sunday for a surge in refugees. About 70,000 Syrian Kurds have fled into Turkey since Friday as Islamic State fighters seized dozens of villages close to the border and advanced on the frontier town of Ayn al-Arab, known as Kobani in Kurdish. A Kurdish commander on the ground said Islamic State had advanced to within 15 km (9 miles) of Kobani, whose strategic location has been blocking the radical Sunni Muslim militants from consolidating their gains across northern Syria. A Kurdish politician from Turkey who visited Kobani on Saturday said locals had told him that Islamic State fighters were beheading people as they went from village to village. "Rather than a war this is a genocide operation ... They are going into the villages and cutting the heads of one or two people and showing them to the villagers," Ibrahim Binici, a deputy for Turkey's pro-Kurdish HDP, told Reuters. "It is truly a shameful situation for humanity," he said, calling for international intervention. Five of his fellow MPs planned a hunger strike outside U.N. offices in Geneva to press for action, he said. The Syrian Observatory for Human Rights, which monitors Syria's civil war, said clashes continued overnight, killing 10 insurgents and bringing the number of Islamic State fighters killed to at least 39. At least 27 Kurdish fighters have died. Islamic State has seized at least 64 villages around Kobani since the onslaught started on Tuesday, using heavy arms and thousands of fighters. It executed at least 11 civilians on Saturday, including at least two boys, the Observatory said.