A student who survived the accident said he saw someone squatting to tie shoelaces on the staircase between the first and second floors when hundreds of students rushed downstairs.

• 据一名事件生还者说当时他看到有人在一楼和二楼的楼梯中蹲下去系鞋带,这时有很多人要匆忙冲到楼下。