Peruvian presidential candidate Pedro Castillo affirmed Monday that he will be "the first to enforce the will of the Peruvian people" and called for calm after his rival Keiko Fujimori made claims of electoral fraud in weekend's runoff.

From the balcony of his party headquarters in Lima, Castillo addressed his supporters gathered outside the premises awaiting the final election tally, and called for calm.

With 94.86 percent of the votes counted, Castillo has 50.28 percent and Fujimori 49.72 percent, according to the Office National Electoral Processes (ONPE).