Voting in Chester County, Pennsylvania, was extended to 10 p.m. Tuesday after poll books delivered to precincts didn't include the names of unaffiliated, independent and third-party voters. It led to thousands of voters having to cast a provisional ballot on Election Day, according to the county's voter services department.

The deadline for all mail-in ballots, including ones placed in drop boxes in Chester County, is still 8 p.m.

Chester County Voter Services identified an issue with the poll books just after polls opened at 7 a.m., Becky Brain, the public information officer for the county, said. The poll books didn't include the names of unaffiliated and third-party voters, Brain said.

Brain said the voter services department rushed to deliver supplemental poll books to its 230

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