South-eastern Europe's "Balkan route", the main passage for migrants to reach more affluent countries to the north, will remain closed permanently, Austria's Interior Minister Johanna Mikl-Leitner told German newspaper "Die Welt" on Thursday. On Wednesday, Macedonia sealed its border with Greece to illegal migrants after Slovenia, Croatia and Serbia, which are on the way to Austria, announced tight new restrictions on migrant entry. "My position is clear: the Balkan route remains closed and that permanently,” Mikl-Leitner told the newspaper.