"There have been several armed criminal attacks in many neighbourhoods of Bujumbura which were apparently coordinated," a senior police officer said, confirming that six people were killed in separate attacks overnight Sunday.
Police spokesman Pierre Nkurikiye declined to comment today on the violence.
Burundi descended into violence in April after President Pierre Nkurunziza launched a bid for a third consecutive term in office, despite concerns over the legality of such a move.
Three people were killed in a shooting at a bar with a fourth killed nearby, overnight yesterday, a witness and police said, while two civilians were also killed in Bujumbura.
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Another person was killed and seven others wounded overnight Saturday in an attack on another small bar. Three police officers were also wounded in attacks.
Burundi is still scarred by memories of its 1993-2006 civil war pitting rebels from the Hutu majority against an army dominated by minority Tutsis.
International alarm has been mounting after repeated appeals to Nkurunziza to enter dialogue with the opposition went unanswered and the political rhetoric grew increasingly poisonous -- drawing comparisons with the hate speech that whipped up the violence in Rwanda.