These threats have, in some cases, delayed voting and thus delayed counting,” Easterly said. She described the threats as “one of many disruptions … within an incredibly complex event that involves hundreds of thousands of election workers and tens of thousands of polling places.

State and local officials across the affected areas are working with the federal government to investigate the bomb hoaxes. Arizona Secretary of State Adrian Fontes, a Democrat, responded to Russia’s apparent role in the threats, saying "Vladimir ...

An already heated presidential race faced further strain from a string of reported bomb threats in battleground states—causing some delays on Election Day.