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

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.

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

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

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