In the morning, unidentified smoke happened at Umeda. The fire was burning at a warehouse underground. Then, The subway decided to suspend train operation on Midosuji Line. But, it took a lot of time to extinguish the fire. So, in order not to cause more confusion, Osaka Municipal Subway decided to run trains on Midosuji Line without stopping at Umeda. This irregular operation was continued until around 16:00.