Most of the houses near the Snoeckgensheuvel were built in the 1930s. However, the skulls have probably been there for a lot longer, possibly since 1880-1900, a police spokeswoman told De Telegraaf.
According to the AD, it were a few rabbits who were very eager to dig under the grass in the garden on Monday evening. The house has since been released again; the police will continue to investigate the origin of the skulls.