Hello @leachypeachy,

This is typically the result of wind and burning debris (a la sparks) being carried from the burning section of the city (or woods, wherever) and falling on a non-burning area that is highly flammable (very dry, combustible, etc.) and igniting.

You often see this with forest fires where the fire will cross roads, rivers, and other natural boundaries as it spreads. Same thing with a city, except the boundaries are not natural but man made.

Hope that helps!

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