Cyberattacks are near the top of the list of most serious threats facing the U.S., with the rivaling concerns about terrorism and North Korea, intelligence officials with President Barack Obama’s administration said.

James Clapper, the Obama administration’s national security director, and Robert Mueller, director of the U.S. Federal Bureau of Investigation (FBI), were among the officials that pointed to cyberattacks as top threats during a hearing Tuesday before the Senate Intelligence Committee.

Clapper, a retired Air Force general, said he has not seen a “more diverse array of threats and challenges” for U.S. national security during his time in the defense and intelligence communities. Clapper led off with cyberattacks in his Senate testimony about security threats facing the U.S.

“I cannot overemphasize its significance,” Clapper said. “Increasingly, state and non-state actors are gaining and using cyberexpertise. These capabilities put all sectors of our country at risk, from government and private networks to critical infrastructures.”

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