Some folks in the Washington, D.C., area are buzzing about what they thought was a UFO atop a flatbed truck on the Capitol Beltway.

Turns out the disc-shaped object was just a run-of-the-mill military drone.

MyFoxDC reports that what drivers saw—and some photographed—around 11 p.m. Wednesday on Interstate 270, and then later on Interstate 495, was an X-47B Unmanned Combat Air System being transported from Edwards Air Force Base in California to the Naval Air Station Patuxent River in Maryland for testing.

Related video: Recent crash raises questions about drone safety.

During its travels through the D.C. area, local station WTOP reported a flurry of activity on Twitter about the strange-looking object.

This not the first time a drone was mistaken for something alien. Last year, a drone being transported by flatbed to Pax River for practicing aircraft carrier takeoffs and landings was also mistaken for a UFO, the Daily Caller reported.