Protesters are gathered at SK Olympic Handball Gymnasium in Seoul's eastern district of Songpa, Sunday, in protest of ballot shortages in the local elections. Yonhap

Thousands of protesters continued to stage a rally near a vote-counting facility in eastern Seoul for the third day Sunday, claiming last week's local elections were fraudulent and demanding a new election.

According to an unofficial police estimate, approximately 3,000 people surrounded SK Olympic Handball Gymnasium in Songpa Ward as of noon. Police estimated a crowd of 30,000 had gathered the previous day.

Protesters are currently gathered at each of the eight entrances, keeping eyes on ballot boxes that remain inside the facility while chanting slogans calling for a do-over of the elections.

An estimated 20 to 30 officials who were said to have been trapped inside reportedly managed to leave early Saturday, though the National Election Commission (NEC) has refused to officially confirm the reports.