Investigators were using sonar technology to check the yard of an Austrian man who held his daughter captive for 24 years to ensure that no more underground dungeons exist on the property, police said Friday.
Leopold Etz, chief of homicide investigations for Lower Austria province, said investigators are also widening their questioning of more than 100 people who lived in Josef Fritzl's house.
Those people lived in the building over the more than two decades that Fritzl held his daughter Elisabeth prisoner in a secret dungeon, fathering seven of her children. 
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