Maricopa County, Arizona, which Biden won by a slim margin, has consistently been the subject of election denialism conspiracy theories. The other five — Michigan’s Wayne County, Pennsylvania’s Philadelphia County and Georgia’s DeKalb, Fulton and Gwinnett counties — were some of the largest Democratic strongholds in their respective states.

Voting in multiple battleground states was disrupted on Tuesday as numerous polling places received death threats, many of which the FBI said it determined had ties to Russia, prolonging polling place hours and raising the specter of election interference.

The emailed threats were all unfounded and targeted polling places, election offices and other government buildings in Pennsylvania.