UPDATE: NORAD has confirmed the JLENS is down and deflating in Moreland Township, Pennsylvania.

A 240-foot U.S. Army blimp broke loose from its moorings at Aberdeen Proving Grounds and drifted northeast above the fall foliage of Pennsylvania on October 28th, knocking down power lines and leaving hundreds briefly without power.

The Air Force scrambled two F-16s from the Atlantic City Air National Guard base to track the blimp, which broke free at 12:20 p.m. Eastern time.

“NORAD officials are working closely with the FAA to ensure air traffic safety, as well as with our other interagency partners to address the safe recovery of the aerostat,” the agency said in a statement.

The aircraft is part of a Pentagon plan to create a net to hunt enemy drones and cruise missiles along the Eastern seaboard of the United States. The cost of the program is now estimated at $2.7 billion. The blimp that broke free of its moorings is one of two that work together. One is a surveillance aerostate with a radar capable of monitoring an area that size of Texas. That one did not break free but was lowered on Wednesday anyway as a precaution. The unmoored blimp was the fire control aerostate that does more precise observation. It reportedly went up just in August.