The Spanish National Police Corps (Cuerpo Nacional de Policía, or CNP) have captured a huge number of weapons during a series of raids conducted in the areas of Biscay, Girona, and Cantabria in Northern Spain. The raids recovered about 10,000 firearms including pistols, rifles, assault rifles, submachine guns, and machine guns, plus about 400 grenades, bombs, and other explosives.
Among the weapons recovered were a large number of CETME rifles, both the 7.62x51mm versions (including what appears to be at least one each of the rare CETME Model A and B prototypes) and 5.56mm CETME-Ls.
Also included in the cache were large numbers of bolt-action rifles, including various generic Mausers (probably of the Spanish variety). However, probably the rarest weapon in the whole lot is what appears to be an example of the extremely obscure Spanish CB-52 assault rifle prototype:
For comparison, an image of the CB-52 from the Coruña Military History Museum:
The full scale of the weapons recovered can be seen in this image, showing a room full of eight-foot-tall stacks of assault rifles and a large number of what appear to be mortar shells: