Officers arrested the suspects in raids in Madrid and seized cash, firearms and drug-related material, the anti-corruption prosecutor's office said in a statement.
"Those detained belonged to various clans in the Camorra and operated in Spain in connection with criminal organisations in Italy," it said.
"They created a business network in Spain in order to introduce earnings from their criminal activity into Spanish financial channels."
The suspects are due to go before a judge for questioning, accused of drug-trafficking, membership of a criminal gang, money-laundering, forgery and tax fraud, the statement said.
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