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

The FBI said many hoax bomb threats in several states appeared to originate from Russian email domains, though federal cybersecurity officials cautioned that the culprits were not necessarily Russian.

Election Day in Pennsylvania saw a huge voter turnout, though bomb threats were called into some polling places. Numerous polling sites across the state received bomb threats throughout the day, prompting officials to call law enforcement to investigate.