Protesters wave Catalan pro-independence 'Estelada' flags as they gather outside the Spanish police headquarters in Barcelona as part of a general strike in Catalonia called by Catalan unions on October 3, 2017. Large numbers of Catalans are expected to observe a general strike today to condemn police violence at a banned weekend referendum on independence, as Madrid comes under growing international pressure to resolve its worst political crisis in decades. / AFP PHOTO / LLUIS GENE