A drone appeared to fly over President-elect Donald Trump's golf course in Bedminster, New Jersey.
The Federal Bureau of Investigation (FBI) has launched an investigation after witnesses spotted a cluster of what appeared to be drones flying along the Raritan River since 18 November.
Flights were also reported to have taken place near the Picatinny Arsenal, a US military research and manufacturing facility.
FBI officials have asked anyone with videos or photos of the flights, or any other relevant information, to contact the agency.
