It looks like something out of a “Ghostbusters” movie. A mysterious, and smelly, greenish-yellow goop fell from the sky in upstate New York last week. The FAA denies it came from a plane (blaming birds), and now the town is puzzled as to what it is:

Initial suspicions focused on “blue ice,” the frozen human excrement known to fall from passing jetliners, but the FAA investigated and quickly dismissed that possibility.

The local flight standards inspectors investigated the situation and determined it was not from an aircraft,” FAA spokeswoman Arlene Salac told ABC News.

The Amherst Town Supervisor’s Office said that they are looking into the situation.