San Diego residents were left baffled by a set of more than ten lights floating in the night sky, sparking speculation of extra-terrestrial activity.<br /><br />Footage filmed last night (August 29) above the California city shows the group of yellow orbs floating high in the sky.<br /><br />The filmer, Daniel Burns, writes: "As I looked from La Mesa towards the San Diego downtown skyline I noticed some orange glowing lights in the sky. <br /><br />"One by one they got brighter and more joined in. Then 2 minutes later they went out. A second set was lit not too long after."<br /><br />The strange sighting caused speculation over whether it was a visit by guests from another planet.<br /><br />One Twitter user wrote: "Extraterrestrial lights randomly appearing in the air of Pacific Beach, San Diego. What are they?"<br /><br />The US Navy later confirmed the UFOs were in fact flare lights from an aircraft training exercise.
