They also found a gun similar to the one used to kill Veronica Guerin in 1996
Six people in total were taken into custody in Alicante after the discovery of four kilos of cannabis and 15,000 pills.
A gun was found buried in a garden which matches the description of the weapon which killed the journalist in Dublin over 20 years ago.
Gardaí are working with Spanish police to determine if it is the same weapon.
