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A stream of mysterious foam has been bubbling out of sewer grates and causing traffic chaos on the streets in a Chinese city.
The foam billowed out from the underground sewers and stretched over 200 metres long across a junction.
Videos emerged on social media showing cleaners flushing it with water but the foam continues to rise.
The white foam covers most of the road, leaving dozens of cars stuck in traffic.
According local media Kan Kan News, the foamy substances appeared on Tuesday afternoon in the city of Xi'an, central China.