LIMA, Peru (AP) — Peru finished tallying votes in the country’s tight presidential contest Thursday but no winner was declared, with electoral authorities saying they were scrutinizing a small number of ballots amid unproven claims of possible vote tampering leveled by the apparent loser.

With votes from rural areas and Peruvian embassies abroad now fully in, leftist Pedro Castillo maintained his narrow lead, with 50.2% of the votes against 49.8% for conservative Keiko Fujimori. The difference between the candidates was 70,774 votes.

Peru’s electoral tribunal, which was expected to take a week or more to officially declare a winner, was evaluating 631 tally sheets, about half of which had been questioned by campaign representatives.

It was not clear how many votes were still up for grabs, but Fujimori said they could total at least 200,000.

Emotions had been running high even before Sunday’s runoff election over what many people viewed as a cruel choice between two populists — Castillo, an outsider who many feared would upend Peru’s free-market model largely based on mineral exports, and Fujimori, who is fighting allegations of corruption that could land her in jail alongside her father, former President Alberto Fujimori.