Dungeon house police use sonar to check for more secrets

Police used sonar today to search the home of dungeon father Josef Fritzl to ensure no other underground prisons exist.

Leopold Etz, chief of homicide investigations for Lower Austria province, said they were also questioning more than 100 people who lodged in Fritzl’s house over the 24 years he held his daughter Elisabeth prisoner, fathering seven of her children.