Burundi's president registered with the national electoral commission on Friday to run for a third term, his spokesman said, a move opposed by protesters who say another five years in office would violate the constitution.
Saturday is the deadline for prospective candidates to submit applications to the election commission, CENI.
President Pierre Nkurunziza "just handed in the file", presidential spokesman Gervais Abayeho told Reuters in a brief text message.