WAILUKU » Police say a 7-inch-long fetus discovered at a Wailuku-Kahului sewage treatment plant was likely a miscarriage that could not have survived outside of its mother’s womb.

The Maui News reports that police say a worker found the fetus in the catchment area of Wailuku-Kahului Wastewater Reclamation Facility on May 22.

Police do not know where the fetus came from originally but said Friday the Medical Examiner’s Office believes it was flushed down a toilet after a miscarriage.

A full autopsy could not be performed because of the fetus’ small size. The gender was not determined.

The Maui Police Department says its Criminal Investigation Division conferred with officials from the county prosecutor’s office and determined that the case was not criminal in nature.