The mysterious “drones,” which have been spotted in multiple states and sparked congressional uproar, were seen this week near the Naval Air Station Joint Reserve Base Fort Worth in White Settlement. 

White Settlement Police Department Chief Christopher Cook said in a statement Wednesday that he first started responding to reports of mysterious “drone” activity near federal and military property Tuesday evening.

“We are working with the FBI, NCIS, and Air Force OSI to determine the flight trajectories and who was piloting the unmanned aircraft. While we do not believe there were any immediate threats related to last night’s activities, it is concerning due to operating in ‘NO FLY ZONES’ near federal and military properties,” Cook said. 

The police chief’s statement follows worries from many Washington, D.C., and state lawmakers that thousands of sightings of unidentified, unmanned, flying aircraft could pose a national security risk. 

A slew of federal law enforcement agencies, including the FBI and Department of Homeland Security, have been working in tandem with multiple states since the beginning of December to determine what the aircraft are and where they are coming from after the sightings were first reported in New Jersey shortly before Thanksgiving. 

A congressional hearing into the matter earlier this month proved largely inconclusive, drawing scorn from some lawmakers who questioned why the government hasn’t shot down the phenomena. 

The White House and other FBI and DHS officials have denied that the “drones” pose a national security risk. However, the Federal Aviation Administration has threatened to use “deadly force” against the aircraft and recently temporarily banned all drone operations in many parts of New Jersey.