Pierre Nkurunziza

Presidential spokesman Willy Nyamitwe said Saturday that Col. Jean Bikomagu was shot in his car. 

Burundi has been rocked by violence since the April announcement that Nkurunziza would stand for another term. 

Nkurunziza won the elections following turmoil in which about 100 people died in months of street protests against the extension of the president's time in power.

Nkurunziza won 69 percent of the vote while his closest rival, Agathon Rwasa, got 19 percent, said electoral chief Pierre-Claver Ndayicariye.

Nkurunziza, 51, was expected to win because he did not face a strong challenge in Tuesday's polls after some opposition groups boycotted the election. Rwasa, the leading opposition candidate, said his campaign had been hindered by officials.