In a statement the Seletar Hash House Harriers, an all- male group that describes itself as a "drinking group with a running problem", apologised for the "alarm and inconvenience" caused to the public.
Three members had sprinkled flour at several points in the underground Woodleigh MRT station, the statement said, adding that it was the safest way to cross a busy road in the suburban Serangoon district.
But the sight of white powder sparked security fears, which saw police and hazardous materials units respond.
"Upon learning of the subsequent investigations at Woodleigh station, our three members stepped forward immediately to identify themselves and have cooperated fully with the authorities," the statement added.
"They are sorry that their actions caused public alarm and inconvenience."
One of the group's members, a 69-year-old man, was arrested for causing public alarm while two others, aged 59 and 70, are helping police with investigations.
The Seletar Harriers is a chapter of a loose worldwide federation of "Hash House Harriers", a running group set up by beer-loving British colonial expatriates in what was then Malaya in 1938.
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