A large amount of white foam sprayed out of three wells near an intersection of East and West Chang’an Avenue in Xi’an. The height of the spray was about 50 cm and lasted 40 minutes, covering 1,000 square meters of the road’s surface. The site has since been cleared and the road has been restored. The foam is odorless, according to the local environmental protection department, which is investigating what the substance is and where it came from.

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