Philadelphia police are trawling through more than one million images taken from a house of horrors once owned by an infamous pornographer and suspected killer, as cops identify a fifth woman tied to the home.

The FBI has increased the number of agents assigned to the sprawling investigation tied to the former home of now-dead photographer Raymond “R.C.” Horsch and his son Eugene.

Following Eugene’s arrest in June, investigators made multiple disturbing discoveries at the home — including alleged snuff movies featuring R.C. and several missing women, vats of mysterious chemicals, and writings referencing serial killers.

Now, authorities and…

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