The German blogger Andreas Müller has apparently gained access to previously classified UFO documents from the German Secret Service: BND (Bundesnachrichtendienst). They contain information about an interesting UFO case from Puttgarden habour in 1986. A large part of the material (67 pages) is however concerned with episodes which took place near the border to Warsaw Pact countries during the Cold War. Several of the cases can be explained away as e.g. Soviet spy balloons. Read a a summary of Müller's article in English.