Some of those arrested were suspected of links to the Belgian suicide bombings in March of last year, which killed 31 people at the Brussels airport and on a metro train, a police spokesman said.
Scientists find footprint of unknown ancient reptile in Spain
The detained were all Moroccans aged between 21 and 39, he said. The raids follow an eight-month investigation of a group of suspected militants with links to organised crime in the Barcelona area, the police said in a statement. The investigation remains open.
Not including Tuesday's arrests, Spain has detained 22 people in 16 separate operations this year in connection with extremism, according to Interior Ministry figures.
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