(AOL) - A man has confessed to imprisoning his daughter for 24 years in windowless cell with a soundproofed door and fathering seven children with her, police said Monday.

Austrian police say the father of a 42-year-old woman identified as Elisabeth F. confessed to holding her captive for 24 years in this hidden bedroom in the cellar of a house in Austria. The room had a thick soundproof door leading to it.

The man, now 73, also told investigators that he tossed the body of one of the children in an incinerator when the infant died shortly after birth, said Franz Polzer, head of the Lower Austrian Bureau of Criminal Affairs.

"We are being confronted with an unfathomable crime," Interior Minister Guenther Platter said.

The daughter, who is now 42, had been missing since 1984 and was found by police in the town of Amstetten on Saturday evening after police received a tip. Click here read full bizarre Scoopy Doop