At about 4:45, on the bridge, the march was stopped by the Kyoto City Police which regarded the march as an illegal demonstration, then a clash occurred, it turned into a tussle, and the south rail of the bridge (wooden rails at that time) broke and fell down.
しかし京都市警察はこれを「不法デモ」とみなし午後4時45分頃デモ隊の渡橋を阻止したため、学生ともみ合いになり橋の南側欄干（当時は木製）が倒れた。