Early Wednesday, Spanish police raided government offices in Catalonia and detained at least a dozen separatist leaders — just 10 days before a planned referendum vote on Catalonian independence.Catalonia, a region in northeast Spain, has its own language and culture. Separatists have long advocated for independence; a vote in 2014 overwhelmingly supported splitting away from Spain, although turnout was low.Madrid did not recognize that vote, calling it illegal — and considers the upcoming referendum, slated for Oct. 1, to be equally unconstitutional.According to El Pais, the Spanish Civil Guard raided multiple Catalan government offices, including the headquarters of the region's departments of Economy; Foreign Affairs; and Labor, Social Affairs and Families. The government arrested 14 people, the newspaper reports, and "among the detained, there are high-ranking officials" from the Catalan government, including the region's secretary of the economy and secretary of the treasury.In the wake of the Spanish raids, the regional president of Catalonia was holding an emergency Cabinet meeting, NPR's Lauren Frayer reports from Madrid.Spanish Civil Guards have already confiscated ballots and told police to block voting stations, Lauren says. Now that they've also detained elected officials, tensions are rising: