London, May 2 (ANI): As the case of Austrian incest dad deepens, the cops are suspicious that sex beast Josef Fritzls wife knew more than shes letting on.

The suspicions clouded on the 67-year-old Rosemarie Fritzl, after it was claimed that she took food supplies to the cellar and may have received shopping ordered in Elisabeths name.

Rosemaries 73-year-old husband has insisted that she had no idea he had imprisoned Elisabeth beneath their home for more than two decades and fathered seven children by her in Amstetten, Austria.

She was said to have been told by engineer Fritzl he spent night after night in the cellar drawing up blueprints for machines.

But a source close to the inquiry said that the questions over how much Rosemarie knew were mounting up.

The questions over how much Rosemarie knew are mounting, The Sun quoted the source, as saying.

Investigators said it defied logic that she could not have been suspicious of deliveries of clothes and other goods addressed to missing Elisabeth, now 42. (ANI)