According to a report in WHIO Dayton, a suspicious-looking jar was found inside a pedestrian tunnel near the golf course at the Yankee Trace Golf Club in Centerville, Ohio. Police said the jar was filled with an unknown liquid. Even more alarming, police said, was that the tunnel wall above where the jar was found had blackened burn marks on it.

The bomb squad’s robot took over and removed the jar from the property. Police said they are now testing the liquid inside the jar, to see what exactly was inside.