Authorities investigating the Austrian man accused of imprisoning and raping his daughter are awaiting old court records that media say document a 1967 rape allegation.

Lower Austria prosecutor Gerhard Sedlacek says the file on 73-year-old Josef Fritzl should arrive Monday or Tuesday.

• Click here to see photos of Josef Fritzl and the "House of Horrors."

Police say Fritzl confessed to fathering seven children with his now 42-year-old daughter Elisabeth he locked up for 24 years. They say three of the children were locked away in a dungeon cellar and that Fritzl confessed to burning the body of one child after it died in infancy.

Sedlacek told The Associated Press Saturday that he did not yet know the contents of the file. He refused to confirm reports that Fritzl had a previous record for a sexual crime.