2:50pm UK, Monday August 04, 2008
Austria cellar rapist Josef Fritzl - who kept his daughter imprisoned in an underground dungeon for 24 years - may face slavery charges.
Josef Fritzl is in jail awaiting trial
Prosecutor Gerhard Sedlacek also said authorities hope to have formal charges ready by the end of September.
If convicted of slavery, he would face 20 years in prison.
Fritzl, 73, who repeatedly raped his daughter and fathered seven of her children, would then face trial in December.
Investigators say he confessed to taking Elisabeth prisoner when she was 18 and sexually abusing her.
He admitted fathering her children, one whom died shortly after birth and whose body he allegedly tossed into a furnace.
Fritzl could face murder charges - and a life sentence - if there is enough evidence to prove the infant could have survived after birth had it received proper medical care.
Police say subsequent DNA tests confirmed he is the surviving children's biological father.
Three of the youngsters lived with Fritzl and his wife in their home while the others stayed with their mum in the elaborate dungeon he created.
It was built under the couple's house in Amstetten,
Austria.
Fritzl's crimes were discovered when Elisabeth's 19-year-old daughter, Kerstin - who had lived her entire life in the cellar - was rushed to hospital on April 19.