Witness Udo Sandhoefer said people streamed into the tunnel, causing "a real mass panic".
"At some point, the column of people got stuck,
probably because everything was closed up-front, and we saw the first people were already lying on the ground," he said. "Others climbed up the walls and tried somehow to get into the grounds from the side, and the people in the crowd that moved up simply ran over those who were lying on the ground."
Another witness said the tunnel was so crowded that people began falling. "It got tighter and tighter from minute to minute . . . people were just pushed together until they fell over," he said.