Some 30,000 absentee ballots in Milwaukee need to be recounted, likely delaying the results in the key swing state of Wisconsin, election officials said.

Milwaukee election officials are recounting roughly 30,000 absentee ballots after issues were discovered with tabulator seals. City spokesperson Jeff Fleming told reporters the redo will likely cause delays in reporting those results in the key swing state.

About 30,000 ballots in Milwaukee will have to be recounted due to a tabulator issue, the city said on Tuesday afternoon.

About 30,000 absentee ballots are going to be retabulated at the city of Milwaukee's central count at the Baird Center, WISN 12 News reports. WISN 12 News reports that several tabulator machines were not closed properly.

From the polling place to the courtroom, ABC News tracks the latest election security developments as experts warn about the spread of misinformation and disinformation from within the U.S. and abroad.

The City of Milwaukee is rerunning thousands of previously processed absentee ballots due to a "human error," election officials said.

Election officials say 13 machines will be zeroed out and ballots rerun.

Milwaukee's central count location will rerun about 31,000 ballots after a "sealing" error with the tabulation machines was discovered.