Three weeks ago, the ranking member of the Senate Homeland Security Committee called on the federal government to examine its efforts to protect election systems and voting machines in the United States against similar attacks.

In Illinois, elections officials said the cyberattack began June 23.

According to an alert obtained by Yahoo! The Illinois Board of Elections attributed the incident to "foreign hackers", but attribution of cyberattacks is often hard. The document, titled "Targeting Activity Against State Board of Election Systems", didn't specifically say which two states were targeted although sources reportedly familiar with the matter identified them as Arizona and IL. While the alert didn't name the states specifically, a source identified the states to Yahoo!

Ken Menzel, general counsel for the elections board, said no files of registered voters were erased or modified and that no voting history information or voter signature images were captured. The IP address numbers can be easily masked to hide an attacker's true origin, but the flash included detailed information about the methods used by the hackers.

IL was one of two states that had their elections database compromised earlier this year.

Personal information on as many as 200,000 Illinois voters was taken earlier this summer when hackers broke into the state's voter registration database, the Illinois State Board of Elections said Monday.

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The FBI's Cyber Division issued a confidential advisory on August 18, but it did not identify the two states that were targeted.Yahoo News, which first reported the breaches on Monday, quoted sources who said voter registration systems in Arizona and IL were penetrated.

In the alert, the Federal Bureau of Investigation lists an IP address, "detected in the July 2016 compromise of a state's Board of Election Web site" and also identified "August 2016 attempted intrusion activities into another state's Board of Election system".

The Department of Homeland Security is unaware of any specific credible threat to the electoral systems, according to a law enforcement official.

The FBI is now warning election officials across the country to take new steps to bolster the security of computer systems.

The FBI suspects the two intrusions were linked.

That's led the the agency to urge state election officials throughout the USA to strengthen their computer systems' security, the report said.