The foam was piled up quite deep in places. Image Credit: YouTube / PunjabSpectrum
Residents of Fukuoka were perplexed when a thick layer of foam started to engulf the city's streets.
The peculiar substance, which first turned up on the city's roads and pavements in the early hours of Saturday morning, appeared following a magnitude 7.0 earthquake which shook the entire Kumamoto region just two days after an earlier magnitude 6.5 quake had struck the same area.
Believed to be directly related to the quakes, the foam has since become something of a social media phenomenon with residents uploading photographs and videos of it online.
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