Police said it was not immediately known who was responsible for the drone.
But he did not acknowledge publicly that the US was responsible for the drone attack, which was confirmed by counter-terrorism officials.
Albania's FA will still have to pay their €100,000 fine after CAS agreed with Uefa that "the FAA was responsible for the drone operated during the match, carrying a banner depicting Albanian nationalistic and patriotic symbols".
Grayling said those responsible for the drone incursions should face prison.
It's unclear who is responsible for flying the drones but the commercialization of drone technology has driven down costs, putting the ability to buzz a nuclear facility within reach of far more people.
John Brennan, the counterterrorism advisor largely responsible for designing the drone program everyone loves, is currently going through contentious confirmation hearings to become the head of the CIA.
No one has claimed responsibility for the drone.
"Let's be clear: Barron is... certainly not responsible for the administration's drone policy or the decisions to authorize an attack," Markey said.
That way, the truck is responsible for the longer haul, while the drones can more easily access the hard-to-reach mailboxes, making for an efficient package-delivery process.
The fourth whistleblower, Cian Westmoreland, 28, was a technician responsible for the communications infrastructure of the drone program.
