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Russian hackers targeted 21 states during 2016 election
J. Scott Applewhite / AP

During a hearing before the Senate Intelligence Committee this morning, officials from the FBI and Department of Homeland Security discussed the scope of Russian interference in the 2016 presidential election and how the federal government is preparing for potential future cyberattacks.

The big thing: Jeanette Manfra, the Acting Deputy Undersecretary for Cybersecurity and Communications at DHS, confirmed that election-related systems in 21 states were targeted in the lead-up to the 2016 election, but reiterated that no vote tallies were altered.

Related: Manfra refused to name those 21 states, but said that the "system owners" had been made aware of the targeting. She also said that some states had data exfiltrated by Russian hackers but refused to provide details regarding the nature or scope of the exfiltrated election data.