Homeland Security Secretary Jeh Johnson held a conference call with state election officials earlier this month to offer the department's help to "manage risks to voting systems in each state's jurisdiction" ahead of the November 8 election, according to a summary of the call posted on the department's website. That incident, widely attributed to Russian hackers, has sparked concern among lawmakers about the integrity of elections systems.

The breaches included the theft of data from as many as 200,000 voter records in IL, officials say. In Arizona's case, malicious software was found in the system but no data was taken, a state official told Yahoo News. He pledged help for state officials in securing their systems, including having the DHS send specially trained staff to help.

The alert, Yahoo's report said, didn't identify the states that were targeted, but sources told Yahoo that they were Arizona and IL. The Illinois Board of Elections said it will notify any individuals whose data was compromised and anyone impacted by the information theft.

The Department of Homeland Security offered cybersecurity assistance to a number of states in the wake of the attack, although it's unclear if any systems changed as a result.

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The majority of data stolen from one state's board of elections website occurred in July, while an attempt to hack into the election system of another state was made in August, according to the alert, which didn't identify the states or what type of data was stolen.

"In furtherance of public-private partnerships, the FBI routinely advises private industry of various cyber threat indicators observed during the course of our investigations", she said in an e-mail.

The Arizona Secretary of State's Office closed part of its voter registration system after the Federal Bureau of Investigation detected "a potential threat" in June and malicious software was found on a computer used to access the system, according to The Arizona Republic. He also mentioned that the Department wasn't aware of any of these threats for the general elections systems, according to a readout of the call he had with the officials. It was not clear if he was aware at the time of the FBI's investigation into the Arizona and IL intrusions.

"Election officials at every level of government should take this lesson to heart: our electoral process could be a target for reckless foreign governments and terrorist groups", said the Aspen Institute Homeland Security Group in response to the DNC hack on July 28.