One Irish person is still being questioned by police in Spain investigating a drugs ring in Ibiza, according to the Department of Foreign Affairs.
A second Irish citizen has been released without charge.
Police were reported to have seized 38,000 ecstasy tablets, 4kg of cocaine, as well as ketamine.
Around €56,000 was also recovered as part of the joint operation by the UK's Serious Organised Crime Agency and the Spanish National Guard.
A total of 14 men and 11 women were arrested including two Irish nationals, a Czech national, a Slovak and a Spaniard, along with 20 Britons from London, Liverpool, Manchester and Newcastle.
The drugs ring is understood to have been led from the UK with two branches in Ibiza.
