Overnight, Allegheny County officials decided to suspend the counting of ballots and resume shortly after 10am Wednesday morning.
Allegheny County Director of Communications Amie Downs confirmed to KDKA Radio that the counting resumed on Wednesday.
Out of 348,485 mail-in and absentee ballots that were returned, 146,537 still needed to be scanned.
According to Downs, the ballots were secured in a warehouse with 24-hour video surveillance and is also patrolled by Allegheny County Police.
Pennsylvania is one of several states still not called in the presidential election as of Wednesday morning.
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President Trump declared victory and said he plans to take his case to the U.S. Supreme Court because he believes a "major fraud on our nation" had been committed.
Biden also believes he'll win the election but that it will take time to count the votes stating, "We knew because of the unprecedented early vote, the mail-in vote that it was going to take awhile . We’re going to have to be patient until the hard work of tallying votes is finished."
Counting throughout the state may likely not be finished for days. In September the State Supreme Court ruled that Pennsylvania could collect ballots for up to three days after Election Day as long as they are post marked by November 3.
In October, the U.S. Supreme Court upheld that ruling in a split decision.