Last month – the head of NORAD and NORTHCOM – the military commands that defend North America – told Congress some of those mysterious drones seen flying inside the United States may indeed have been spying. He did not say for whom. 60 Minutes has been looking into a series of eerily similar incidents – going back years – including those attention getting flyovers in New Jersey recently. In each, drones first appeared over restricted military or civilian sites, coming and going – often literally – "under the radar." The wake-up call came just over a year ago, when drones invaded the skies above Langley Air Force base in Virginia over 17 nights, forcing the relocation of our most advanced fighter jets. Our story starts with an eyewitness and an iPhone.