This handout picture released by the Spanish Civil Guard on September 19, 2017 shows material, such as envelopes bearing the logo of the Catalan regional government Generalitat, that could have been used for the organization of Catalonia's independence referendum, seized at different premises of the private postal service company Unipost. The Catalan regional government is determined to hold a referendum on October 1, despite the vote being banned by the Spain's Constitutional Court. / AFP PHOTO / Spanish Guardia Civil / Handout / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 