The paste, which is used as the basis for making cocaine, was found inside furniture that was shipped to the port of Barcelona and transferred to several nearby warehouses, officers said in a statement.
They gave no estimate for the street value of the drug, saying only that it would be enough paste to make about one tonne of cocaine.
The drugs ring is suspected of recruiting impoverished individuals who were sent to Peru where they lived for several months at the group's expense while pretending to work before returning to Spain.
"The person would return to Spain by plane and the furniture was shipped by sea in containers that were sent to different storage facilities in Barcelona from where they would be picked up by members of the criminal group," it added.
Spanish police detained eight men and five women suspected of making up the smuggling ring as part of their investigation which was carried out with the help of the US Drug Enforcement Agency.
Spain's close ties with its former colonies in Latin America have made it the main entry point used by drug smugglers to bring cocaine into Europe.
Spanish authorities seized over 22 tonnes of cocaine in 2015, a 43 percent increase on the previous year.
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