barcelona demonstrators call catalan independence gather hundreds towns across region sunday follow madrid action last week try block referendum self rule consider illegal spanish police arrest catalan officials involve organize oct. vote also seize electoral material include ballot paper ballot box lead several days protest barcelona carles puigdemont head catalan regional government say referendum go ahead several thousand protesters gather central barcelona sunday chant vote hand ballot paper crowd begin whistle boo police helicopter speeches protest organizers show grow anger among referendum supporters increase police presence 3,000 4,000 state police officer regions spain arrive way catalonia feel occupy spanish police 56-year-old interior designer nuria gimenez say protest 10 years go stop one week go need keep go end saturday state prosecutor catalonia tell local national police force would place temporarily single chain command report directly interior ministry madrid catalan government initially say would refuse order though head catalan regional police know mossos esquadra late say would comply prosecutors speak crowd barcelona president catalan parliament carme forcadell say separatists must resist provocations central government see violence catalonia none peaceful people want exercise right forcadell say although poll show less half catalonia 5.5 million voters want self-rule wealthy northeastern region want chance vote issue catalan separatists take streets ahead referendum