Multiple nation-states are investing in their capabilities to hack critical U.S. infrastructure, making defense of those networks a top priority, U.S. National Security Agency chief Admiral Mike Rogers said Thursday.

Attackers are seeking detailed information on how industrial control systems work, including obtaining engineering schematics and information on how such systems are configured, said Rogers, who spoke before the U.S. House of Representatives Permanent Select Committee on Intelligence.

Such information could allow hackers to shut down “very segmented, very tailored” parts of networks, such as turning off power turbines, Rogers said.

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