Federal authorities have finally stepped up efforts to investigate a rash of mysterious drone sightings that have been made nightly over a growing swath of the Eastern Seaboard for nearly a month.

The Department of Homeland Security and the FBI are deploying drone detection technology and infrared cameras to determine what if any threat the unidentified flying objects pose, according to ABC News.

White House national security communications adviser John Kirby said Thursday it’s believed that “many” of the rogue aircraft seem to be ordinary and lawfully operated, saying there was “no evidence at this time that the reported drone sightings pose a national security or public safety threat, or have a foreign nexus.

The drones first appeared in New Jersey night skies on Nov. 18, hovering in airspace not far from President-elect Donald Trump’s golf club in Bedminster and the Picatinny Arsenal military facility in Wharton, NJ.