article_snippet: Scroll down for video .
article_snippet: The unnamed resident said inside the strongbox The unnamed resident found vessels containing a white, gooey matter.
article_snippet: But surprise quickly turned into alarm when the syrupy sludge reacted with water.
highlights_snippet: On-site testing failed to identify the liquid, but the liquid had a chemical reaction with water .
  
highlights_snippet: Vials of the white gooey matter were sent to environmental lab for further testing .