An Austrian man allegedly held his daughter captive in a cellar for 24 years and fathered four children with her, reports say.
The existence of the woman, believed missing since 1984 and now 42, emerged after one of the children was found in the house in a "serious condition".
A search was begun by the authorities for her mother after she was found, Austrian broadcaster ORF reports.
The 19-year-old is now in hospital in the Lower Austrian town of Amstetten.
An investigation has been launched, a police source told The Associated Press on condition of anonymity. ORF identified the father as a 73-year-old man and said the teenager had been found unconscious in his house.
BBC NEWS | World | Europe | Austrian 'hid daughter in cellar'
Jeez!