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Approximately 30,000 ballots cast by Milwaukee voters will have to be recounted due to a glitch in a tabulator.

City spokesperson Jeff Fleming, a Fox News affiliate reported, said Tuesday that the doors to 13 sealed tabulators failed to close properly, impacting early absentee and in-person ballots. 

The opened ballots will need to be reprocessed, which could take hours, the city said. 

Paulina Gutiérrez, executive director of the Milwaukee Election Commission, taught election workers how to fix the problem going forward.