Plane departures within the United States are halted until at least 9 a.m. EST (14:00 GMT) due to a problem with a system used by pilots, according to US authorities.

Iran PressAmerica: The US Federal Aviation Administration (FAA) said Wednesday that it was working to restore a system that alerts pilots to hazards and changes to airport facilities and procedures and which had stopped processing updated information, known Notices to Air Missions, or NOTAMs. The glitch has led to hundreds of flight delays in the US.

“There is no direct evidence of a cyberattack at this point,” Jean-Pierre tweeted.

However, Biden later told reporters he had spoken to US Secretary of Transportation Pete Buttigieg.

“They don’t know what the cause is,” he said. “I told him to report directly to me when they find out. Air traffic can still land safely, just not take off right now.”

Buttigieg said in a tweet that he is in touch with the FAA and monitoring the situation.

There are arrival and departure delays at airports across the US affecting at least 3,700 flights, according to the tracking website FlightAware. More than 670 have been canceled, and that number continued to tick up Wednesday morning.

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