Russia is behind a series of false bomb threats in Georgia and other states, federal and local officials said. As a result, some polling stations were temporarily closed until checks were carried out.

“The FBI is aware of bomb threats to polling places in several states, many of which appear to originate from Russian email domains,” the federal agency said in a statement. “None of the threats have been deemed credible so far,” it said.

Although the FBI did not name the states targeted, local officials said there were at least six threats in Georgia alone, all in Democratic-leaning areas in the greater Atlanta area. Four occurred in Fulton County, including two that closed polling places for half an hour and another threat in neighboring Gwinnett County that shut down a polling place for 30 to 40 minutes, a state official said on condition of anonymity.

Another threat targeted a polling place in Clayton County, the official said.