In the joint Franco-Spanish operation, police detained seven people and seized more than 1,700 kilos of hashish, as well as guns, unspecified police equipment and a "sophisticated system of number plate duplication," it said in a statement.
"To rob drugs, they pretended to be members of state security forces with the help of false ID, guns with a lot of ammunition and police equipment," it added.
Drug gangs are becoming increasingly bold in southern Spain, unloading hashish on beaches in broad daylight and clashing with police, alarming authorities.
The Spanish government has responded by sending extra police to the area.
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