What caused the FAA to ground flights heading to the Philly airport on Monday?

As reported by PhillyVoice · Updated 21 Sept, 21:56

The Federal Aviation Administration temporarily grounded flights into Philadelphia International Airport and other East Coast airports on Monday after a circuit blew at an an air traffic control facility in Philadelphia and a backup line in New Jersey was damaged.

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• What caused the FAA to ground flights heading to the Philly airport on Monday?PhillyVoice · 21 Sept, 21:56