Live Updates: FAA Issues Nationwide Ground Stop for All Flights

Homeland Security Secretary Markwayne Mullin speaks with members of the press on the White House grounds Friday.

Homeland Security Secretary Markwayne Mullin said there is currently no reason to suspect a national security threat was behind a communications outage that grounded all U.S. flights.

However, he said he would not rule out any cause for the outage, including a cyberattack.

“There is no indication that we have had, no reason to believe that at this point in time this was a threat to the United States,” Mullin told reporters at the White House, later repeating that there was “no indication at this time that this was a nefarious attack against us.”

“It was a telecommunications failure,” he said.

He said all flights were accounted for and air flights were handled “on a case-by-case basis.”

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