A desperate search is on for a pair of teenage girls who vanished after fleeing a suburban sex dungeon hours before police raided the property.
Police believe the girls, aged just 15 and 16, were being held captive at the Detroit, Michigan, property alongside three older women found beaten and locked in cages.
The women, including two aged 31 and one aged 41, told officers they had been forced into sexual slavery after being lured to the house and plied with heroin.
The women were rescued last Thursday after police received a 911 call stating there were four dead bodies at the South Electric St address.
They were found locked in an upstairs bedroom inside a large metal cage.
All had been subjected to repeated beatings and required hospital treatment.
Police have charged Richard Knider Jackson, 67, with a string of offences relating to the operation of a sex-trafficking ring.
The Michigan Attorney General Barbara McQuade's office said one of the women told officers that Jackson had forced her and four others, including two underage girls, to prostitute themselves from the home.
"She said that Jackson provided all of them with drugs, and that he was violent with them," McQuade said.
"Police also found a large black steel gate and lock on the stairs to the upstairs of the residence."
The woman told officers she had helped the teens escape just hours before police arrived by helping them climb through a bathroom window that had been left open.
"[The] two young girls who escaped, we'd really like the public's help in identifying them to get the help they may need," FBI agent Michael Glennon told reporters at a press conference.
Police will allege Jackson and his associates would get the "girls" hooked on heroin to keep them in the house. Hypodermic needles were found scattered in every room.
The man allegedly advertised the girls for sex dates on an adult website and would drive them to meet clients.
After his arrest, Jackson, who has 17 aliases, admitted to living at the property where the women were found but denied any involvement in drugs or prostitution.
The alleged sex-trafficking ring mastermind remains in jail after being denied bail.
Jackson has previously been convicted of assaulting a police officer, armed robbery, carrying a concealed weapon and drug dealing.