English and American troops reinforce West Berlin as the East German's build the Wall.
Young man defects to West by using ladder to climb over Berlin Wall and into waiting truck.
East German workers clear areas which border on to the Berlin Wall.
Colour material at the Berlin Wall - people wave across to friends and relatives over the barrier.
Shots of Kennedy's UN speech intercut with pictures of activity around Berlin's new border.
American President Kennedy visits the Wall during his fourth day in Berlin.
Kennedy reads his press statement on the Berlin crisis.
Russian leader Nikita Khrushchev visits the Eastern side of the Berlin Wall. Germany.
More barriers go up to block flow of refugees from East to West Berlin.
Dramatic footage of angry crowds facing East German guards as Berlin is divided.