Invisible UFO spotted for three hours on radar by air control at Bremen Airport in Germany.This made headlines in Germany and i read it this morning: there has been a UFO sighting at the Bremen airport in Germany from Monday night0(01/06/2014) towards Tuesday morning (07/01/2014) local German time. Air traffic had to be shut down and numerous flights have been either redirected to Hamburg and Munich airport or been completely cancelled as air control spotted a UFO on their radar. The UFO would disappear and reappear on the radar for full three hours, a helicopter was dispatched to investigate the territory but couldn't detect anything. the UFO was invisible to the naked eye, but was picked up by the radar. Air control was highly alert and closed the air space as the security responsibles felt threatened by the unknown presence hovering over the aiport.