Security officials in Burundi say 11 policemen have been injured in overnight grenade attacks in the capital Bujumbura.
Blasts and gunfire were heard across the city during the simultaneous attacks on police posts and vehicles.
The attacks took place in districts that have seen protests against President Pierre Nkurunziza's intention to seek re-election.
Since his announcement in April Burundi has also seen a failed military coup.
Police have blamed the attacks on opposition activists. A senior police official told AFP one of the officers was seriously injured.
BBC's Africa Editor Mary Harper says It is possible that violence will escalate ahead of parliamentary and presidential elections next month.
Burundi's main opposition leader has said he will participate in next month's presidential election if certain conditions are met.
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