Firefighters in Germany are struggling to contain giant forest infernos covering an area of more than 500 football fields. It's happening only 30 miles from the German capital of Berlin. But the firefighting efforts are complicated by the region's history. Ammunition from World War II, buried in the ground, has been exploding. Because of the danger from the old ammo, firefighters are not allowed to enter some areas affected by the blaze. Instead, they have to try to fight the fires remotely.