FILE - In this Aug. 13, 1961 file photo a worker builds parts of the a wall between the eastern and the western part of Berlin. AP Photographer Peter Hillebrecht was on assignment in Berlin as the construction of the Berlin Wall starts on Aug. 13, 1961 and he was one of the first photographers to cover this historic event. When the wall was first built, nobody knew what was going to happen next. Many people were afraid that the wall would serve as a provocation and turn to the Cold War into a hot one. (AP Photo/File)