Mushroom Kingdom Fire Department
From the Super Mario Wiki
The fire department appeared once in The Adventures of Super Mario Bros. 3 episode "Reign Storm". In the episode, Kooky von Koopa's Robot Princess had ordered the fire department to extinguish every Fire Flower in the Mushroom Kingdom. Unaware that the Robot Princess was a fake, the fire department was seen soaking a group of Fire Flowers, assumedly killing them. This event was unusual, since Fire Flowers can survive being underwater in many games.