Live fire department working scene

On the way home last night, we found our route was blocked by the fire department. There were quite a few fire trucks, polices cars and a lot of firemen. Before taking detour, Yaya insisted that we stop somewhere and watch. There were a lot people standing across the street from the house on fire, watching. Peter got excited seeing the helicopter and firemen. Of course, Yaya got tons of questions to ask"what is smoke?""why they pour water from high up in the sky first, why they stopped?""how can a house get on fire?""why can't we talk to the firemen?""Why smoke looks like cloud?"... She kept her questions until dad was home 3 hours later.