Timothy Jay Vafeades, also known as the “vampire trucker” because he wore vampire-fang dentures, had a total of six sex slaves as he traveled across the country, that’s four more victims than he was originally believed to have had, The Associated Press reports.

According to recently filed documents, prosecutors now allege that Vafeades, who was taken into custody in Minnesota in 2013, abused and assaulted his victims in his semitrailer. The documents, according to Reuters, allege that Vafeades told his victims not to talk to other people.

One victim, known as Victim C, had her teeth filed with a drill, prosecutors say. He also took Victim C’s identification, hit her with a belt and altered the appearance of her hair, prosecutors allege.

Vafeades, who prosecutors allege kept his victims as sex slaves for months at a time, has pleaded not guilty to several charges, including kidnapping and possession of child pornography.