30 shotguns and pistols discovered behind false wall
The collection was discovered when builder Simon Berni started work on the house.
The guns were wrapped in newspaper dated from March 1996, soon after the Dunblane shooting.
It is thought that the owner hid the unregistered firearms because he feared losing them.
South Wales Police said: ?Police in Barry are investigating the discovery of up to 30 old firearms at a property under renovation in Dinas Powys. It is believed that they remained undiscovered for several years, having been concealed by a previous owner of the property.?