Nkurunziza won 69.41 percent of the vote in Tuesday's polls, handing him an immediate first-round victory, the election commission said.
He won 16 out of 18 provinces, with the other two taken by his closet rival Agathon Rwasa -- who won 18.99 percent -- even though he had denounced the polls as illegitimate.
"We are very happy with this result," said Pascal Nyabenda, the head of Nkurunziza's ruling CNDD-FDD party, while insisting that the president will not be seeking a fourth term in 2020.
Nkurunziza's candidacy was condemned as unconstitutional by the opposition and provoked months of protests and an attempted coup, and his victory could trigger donor sanctions against the already impoverished nation.
There are also widespread fears the country, situated in the heart of central Africa's troubled Great Lakes region, could be plunged back into civil war.
"What has just happened is the climax of a coup d'etat against the constitution by President Nkurunziza," fumed Jean Minani, a prominent opposition leader.
Although eight candidates were on the ballot paper for the presidential polls, most withdrew from the race, with the closure of most independent media preventing them from campaigning. The election commission insisted however that turnout in the polls was a healthy 73.44 percent.
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