Investigators at a Colorado funeral home where nearly 200 abandoned bodies were found encountered human remains, bodily fluids, flies and maggots throughout the building, an FBI agent testified.

Police searched the Return to Nature funeral home after receiving reports of an "abhorrent smell." The owners are now facing charges of theft, forgery, money laundering and the abuse of a corpse.

Police were called to the Return to Nature Funeral Home earlier this month after receiving reports of a strong odor. What they found inside was "horrific," the county sheriff said.