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Brazilian police say they've made three arrests and are seeking a fourth person in connection with a nightclub fire that killed more than 230 people. Inspector Ranolfo Vieira Junior said at a Monday news conference that the arrests are for investigative purposes. More than 230 people died early Sunday during the fire at a university party in southern Brazil. Police have said they think a band's pyrotechnics show ignited sound insulation on the ceiling, causing the blaze.