The active section of the detector, under construction in Ash River, Minn.

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The sadhus, many of them naked, dreadlocked and smeared in ash, ran to the river amid heavy security.

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And then a whisper of wind coming off the river dislodged the ash.

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They will record plant species, forest structure, ash cover, soil properties, river sediment and the overall topography of the burned area.

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Ash trees are about 4 percent of the state's forests, and 80 percent of the state's 45 million ash trees are found west of the Connecticut River.

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The incinerator the ash came from is at Byker on the banks of the River Tyne.

BBC