
The central African nation has been in turmoil since April 2015 when President Pierre Nkurunziza vowed to run for a third term, sparking protests by the opposition who said his bid was unconstitutional.
His government foiled a coup in May and won re-election in July, but the poll was disputed and clashes and gun attacks have continued.
Celestin Singirankabo, the regional administrator of Gisozi commune in Mwaro province some 60 km (37 miles) east of the capital, Bujumbura, said one of the people killed on Friday was a village administrator.