1A fire (as a disaster) — a building, forest, etc. burning, usually from an accident or carelessness.
昨夜、隣町で大きな火事があった。
There was a big fire in the next town last night.
火事だ！早く逃げて！
Fire! Get out quickly!
台所の火の不始末が火事の原因だった。
Carelessness with the stove in the kitchen was the cause of the fire.
火事の後、住民たちは避難所で一晩を過ごした。
After the fire, the residents spent the night at an evacuation shelter.