Firefighters in Germany are set to battle flames for several days in the northern Harz district, although a fire there is no longer spreading, a district fire chief said on Saturday. “We succeeded in securing the fire with a lot of manpower and technology,” said Harz district fire chief Kai-Uwe Lohse. The flames are burning along a length of 1,000 metres at Königsberg, a sub peak of the Brocken mountain, the highest in the area. Firefighters in planes fought the flames until nightfall, according to district officials. Long plumes of smoke were earlier visible drifting over the mountain slope a…