According to Serbian news, on September 10, a man snapped a UFO floating over the town of Bukovac. He's offered the footage up for analysis and has gone so far to recruit a physicist at the nearby University of Novi Sad to check out the film. And to make matters weirder, the air force had no record of civilian flights over Bukovac at that time. Finally, a reason to use that #SerbianUFOParty2011 tag I've been forever itching to implement!
Hat tip to AdoraBelle!