I was sitting in front of my laptop watching some videos. Then I went to the bathroom to smoke a cigarette and I opened the window. That was when I heard strange noises outside; They slowly became louder as if the UFO came closer. I looked in the sky and I spotted a weird aircraft. On it's bottom side lights shined in red and green and another bigger one in white. It hovered over the city, slowly moving north and it then moved faster straight north-west.