A polling station in a secondary school was vandalised on Friday night ahead of Catalonia's independence referendum. A group of 20 masked people defaced walls with pro-Spain graffiti and smashed a window at El Calamot school in Gava as 4 people slept inside. The following morning pro-Spain protesters walked past the school chanting «long live Spain» and «a united Spain will never be divided... Еще.» Catalan police were on site for the second incident. Catalonia is holding a referendum on independence on 1 October, which Madrid disputes as illegal and unconstitutional. Ballot papers have been seized and extra police housed on docked ships as Spain attempts to prevent the referendum from taking place. Parents and students are occupying 163 schools that will be used as polling stations to ensure that the vote can take place.