The suspects were arrested in a town outside Madrid and in several locations in Morocco -- Fez, Casablanca, Nador, Al Hoceima and Driouech -- during a joint operation between the two countries, the ministry said in a statement Tuesday.
They are accused of being part of a network that recruited and sent foreign fighters to join the ranks of ISIS, it said.
The investigation is ongoing, it said.
The statement did not say what had prompted the arrests.
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