Investigators in Mercer County are delving into the circumstances surrounding partial human remains discovered in the Shenango River Reservoir. As reported by WPXI, the unsettling find was made near the Golden Run Wildlife area around 10 p.m. on Tuesday.

The Mercer County Coroner’s Office is currently attempting to piece together this grim puzzle, though details, such as how long the remains had been submerged in the reservoir's depths, are yet undisclosed. In a statement obtained by CBS Pittsburgh, it has been confirmed that forensic testing will be conducted in an effort to ascertain identity and cause of death, as these remain unknown.

In response to the grisly discovery, search and recovery operations have been mobilized. The Mercer County Emergency Management Agency has been tasked with coordinating search efforts, indicating a deeper probe into the reservoir’s waters is underway to locate any further human remains or evidence related to the case.

With the probe still in its infancy, the community waits, the specter of the unknown hovering over the tranquil waters of the Shenango River Reservoir.