Department of Homeland Security Secretary Markwayne Mullin at a news...

Department of Homeland Security Secretary Markwayne Mullin at a news conference speaking on the nationwide grounding of flights order that's since been lifted.  Credit: Shawn Thew/EPA/Bloomberg

“There's nothing completely certain right now. It doesn’t appear that way,” Homeland Security Secretary Markwayne Mullin said, referring to whether this could have been a cyber attack. “There’s no chatter, we haven’t seen any footprints … or identifications of people who got into the system. It appears this was mechanically driven.”

But, he said, “This is a national security risk.”

“This is what happens when Congress kicks the can down the road.”

“We’ve seen zero evidence this was a cyberattack,” he said

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