Members of a joint prosecution-police investigation team arrive at the National Election Commission’s election control center in Gwacheon, South Korea, to conduct a search on June 11. Photo by Asia Today

June 20 (Asia Today) -- A joint prosecution-police investigation team worked through the weekend questioning witnesses and analyzing seized records as it expanded its investigation into ballot shortages during South Korea's June 3 local elections.

Investigators are examining whether administrative failures at the National Election Commission contributed to confusion at polling stations, including the decision to print fewer ballots and allegations of improper spending.

Legal sources said the investigation team questioned the election manager assigned to a polling station in Seoul's Gaepo 2-dong district as a witness Saturday afternoon.

Investigators were also analyzing polling records and server data seized during a June 11 search of the election commission's headquarters in Gwacheon, south of Seoul.