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bbc.co.uk / 25 August 2011 Last updated at 15:28 GMT.
Police are investigating the alleged abuse at a house in the village of St Peter am Hart.
Police in Austria have arrested a man suspected of imprisoning and sexually abusing his two daughters in his village home over 40 years.
The man, now 80, denies the abuse, which allegedly began when one girl was aged 12 and the other four.
Police say the case was reported in May, when the daughters escaped after one reportedly knocked over the father as he tried to rape her.
Now aged 53 and 45, they were both found to have "mental deficiencies".
Austria's Die Presse newspaper says there are echoes of another Austrian case, that of Jozef Fritzl, who is serving a life sentence for imprisoning and raping his daughter, fathering seven children with her.
There was no mention of any children being fathered in the new case.
'Threatened with pitchfork'
A social worker found the alleged abuser who had been lying on the floor for two days, incapacitated by his fall.