The FBI and Department of Homeland Security said on Saturday that ongoing investigations around reported drone sightings over New Jersey have found many reports are, in fact, manned aircraft.

Dozens of witnesses have reported seeing drones in New Jersey starting in November. At first, the drones were spotted flying along the scenic Raritan River, a waterway that feeds the Round Valley Reservoir, the state’s largest aquifer, about 50 miles west of New York City.