The article reports that they're air dropping ping-pong balls filled with flammable chemicals to fight the fire; I've never heard of this technique before.
This method is quite common, especially where the terrain is dificult and or where the fire is unpredictable due to winds etc which also poses a significant risk to fire fighting ground crews.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
John Lubbock