FILE - In this June 19, 1988 file picture, Michael Jackson performs during an open air concert in West Berlin. Germany's Bild newspaper is reporting that the concert prompted security concerns for East Germany's secret police. The top-selling newspaper published a message from the files of the former Stasi on Thursday July 30, 2009. It said East German officials thought the Jackson concert in front of the Reichstag could be used to test the authorities east of the Berlin Wall. (AP Photo/Elke Bruhn-Hoffmann)