An unspecified number of voter registration forms were flagged as fraudulent, Lancaster County officials said in a news conference.

Officials in Lancaster County, Pennsylvania, have announced that they have identified “as many as 2,500 completed voter registration forms” as being possibly fraudulent, less than two weeks before the hotly contested November election.

Lancaster County officials announced Friday that they are reviewing roughly 2,500 voter-registration applications that were submitted just before the state’s deadline after flagging indicators of possible fraud.