An official in Burundi says presidential elections have been postponed by nearly a week, after a U.N. official warned the president's decision to seek a third term could spark an explosion of violence.

Presidential spokesman Gervais Abayeho said Saturday the vote will be held July 21, six days later than originally scheduled.

Burundi has been hit by violence since the April announcement that President Pierre Nkurunziza would run for a third term in presidential elections that had been set for July 15.

Protesters say Nkurunziza must go because the constitution limits the president to two terms, but the president's supporters say he is eligible for a third term because he was chosen by lawmakers — and not popularly elected — for his first term.