The ministry said the man had become more radical in recent weeks, posting videos of IS executions of prisoners on Internet sites he managed, as well as pictures of alleged IS members with weapons. He also posted a photograph of himself with a handgun.
The detention comes after police in Ceuta on Tuesday arrested three suspected members of a jihadi cell that sought to recruit IS fighters. A fourth was arrested in Morocco.
Spain has arrested dozens of suspected jihadi militants and sympathizers in recent years.
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