A sightseeing boat carrying dozens of Bulgarian tourists sank today in a lake on Macedonia's western border, and at least 15 people drowned, police said. The boat, called the Ilinden, sank rapidly into Lake Ohrid, police spokesman Ivo Kotevski said. Rescuers pulled 53 survivors from the water, including four who were unresponsive and were taken to hospital in the town of Ohrid, he said. At least 15 bodies have been recovered from the lake - the deepest in the Balkans, located along the mountainous border between Macedonia and Albania.