Tunisia says Islamic State attacked border to control town

By Tarek Amara TUNIS (Reuters) - Tunisian Prime Minister Habib Essid said on Tuesday Islamic State militants had carried out the huge raid on Ben Guerdan on Monday that killed 55 people in an attempt to control the town and expand their territory. Tunisia has become increasingly concerned about violence spilling across its frontier as Islamic State has expanded in Libya, taking advantage of the country's chaos to control the city of Sirte and setting up training camps there. Dozens of militants