Philadelphia police and federal investigators have returned to the home of late pornography producer Raymond “R.C.” Horsch in Olney, executing a warrant as part of an investigation into several missing women and a possible serial killer. The renewed search is expected to involve further digging and road closures, disrupting nearby residents and businesses.

Authorities have linked seven missing women to the property, and at least five are believed to have died. Investigators recovered more than a million photos and videos and are examining what they show; Horsch was known for producing violent pornography and died last year, aged 82. His son Eugene was arrested in June on firearms and forgery charges, after which police made concerning discoveries at the family home.