Why are mysterious drones flying over New Jersey?

The night skies over New Jersey have come alight as dozens of mystery drones have been spotted flying over the state, including near United States President-elect Donald Trump's golf course in the town of Bedminster. The drones, which some residents say appear larger than hobbyist drones – those used for recreational purposes – have been spotted almost every night flying over the northeastern US state since November 18 and were initially sighted near the Picatinny Arsenal, a US military research and manufacturing facility. So, who is flying these drones and what are they doing above New Jersey? In a post on Facebook on December 4, cautioning residents of Florham Park, a borough in New Jersey, about the drones, chief of police Joseph Orlando wrote: "Over the past two weeks, the (drone) sightings have been occurring nightly…beginning just after sunset and lasting well into the early morning hours." He described the appearance of the drones as "nefarious in nature".