Peruvian presidential candidate Keiko Fujimori will hold out until the last ballot is counted in a photo-finish run-off election, her spokesman said Thursday, dashing front-runner Pedro Pablo Kuczynski's hopes she might concede.

"Absolutely no one can claim victory," said Pedro Spadaro, spokesman for Fujimori's party, as she trailed fellow right-leaning candidate Kuczynski by less than a quarter of a percentage point with 99.99 percent of the votes counted.

"We have the right to see all the Peruvian people's votes counted. The electoral process is not over," Spadaro told a press conference.