Video footage has emerged of the strange event, which left some scared for their safety.
Jeff Ermoian revealed he grabbed his phone to capture the anomalies after spotting them outside his house.
But he was not the only one that noticed the phenomenon in San Diego, California, USA.
Several different clips have now emerged online, alongside eyewitness accounts that claim US fighter jets scrambled to the location soon after.
“Looks like some kind of secret military drones in operation”
One video, uploaded to conspiracy channel thirdphaseofmoon has now racked up more than 11,000 hits in a number of hours.
And viewers had their own opinions on what it could be.
“Looks like some kind of secret military drones in operation,” one believed.
Another added: “We could have an alien invasion on our hands.”
And a third claimed: “This must be alien visitors.”
But authorities have been quick to shut down the rumours, with an official at the Naval Air Station North Island in Coronado claiming the lights were caused by flares.
They went on to reveal the whole incident was part of a military training exercise but gave no additional information.
Some are still not convinced though, with conspiracy theorist claiming it could be a cover up.