This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

FUKUOKA, Japan — The devastating earthquakes that struck southern Japan this week have claimed at least 41 lives across several cities, with more still missing, and injured hundreds. Saturday’s magnitude 7.3 tremor was the heaviest the country has felt since the 8.9 quake in 2011.

The earthquakes have caused untold amounts of damage, but on Saturday, residents of the city of Fukuoka discovered an especially strange result: a mysterious foam blanketing the streets.

Twitter users began posting photos of the unexplained foam shortly after the tremors receded.

Some have speculated that an underground pipe had burst, although the origin is still unclear.

A city spokesperson told The Independent they did not know anything about the bubbles. What exactly the bubbles are made of is still a mystery. One Twitter user called it “disgusting.”