Transportation Secretary Sean Duffy said Sunday that two routers from FAA facilities in Texas and Arkansas are undergoing extensive testing as investigators examine whether faulty equipment or an installation problem triggered the nation's longest nationwide ground stop in 25 years .
Appearing on "Fox News Sunday," Duffy said that investigators have found no indication of a foreign cyberattack, although the FBI and other federal law enforcement partners remain involved in the probe.
"We think it was the installation or the router that was the bad actor," Duffy said. "But we're open, if we see something else, we're gonna continue to investigate…
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