"Last night, several police posts as well as police vehicles were attacked with grenades. Eleven police officers were wounded, one of them seriously, and police responded with sustained gunfire," a senior police official told AFP, blaming demonstrators opposed to President Pierre Nkurunziza's controversial bid for a third term in office.
Officials said the attacks took place in the districts of Citiboke, Nyakabiga, Musaga and Jabe, which have been at the centre of weeks of unrest sparked by Nkurunziza's decision to seek a third consecutive term in elections slated for mid-July.
The sound of explosions and heavy gunfire echoed across the capital yesterday night.
Residents in the affected areas said they were unsure who was behind the attacks, although some blamed the police and accused security forces of "terrorising the population".
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Burundi's opposition and activists say Nkurunziza's re-election bid is unconstitutional and a violation of a 2006 peace deal that ended 13 years of civil war.
Parliamentary elections are planned for June 29, ahead of the presidential vote on July 15.
More than 100,000 people have fled the violence to neighbouring countries.