RALEIGH, N.C. — Elections officials say Russian hackers targeting election systems across the United States last year skipped North Carolina with their cyberattacks.

The State Board of Elections & Ethics Enforcement said Friday North Carolina wasn’t among the 21 states whose election systems were targeted by Russians during last November’s election. State officials say they received word from the U.S. Department of Homeland Security earlier Friday.

Wisconsin and Washington state officials say Homeland Security reported Russian hackers unsuccessfully tried to access election systems in their states.

The North Carolina agency says it’s still reviewing what caused Election Day problems in Durham County with software that checked whether voters were registered to cast ballots and asking federal authorities to clarify whether they’ve ruled out Russian interference.