During the evening of july 15, 2015, i went on my balcony and looked at the stars for a few seconds. i immediately saw a silent dark triangle passing over my building with three rounded dark red dots at each corner. it went straight from south to north and i could see it no more than 5 seconds before it disappeared, hidden by the roof of my building. i am not sure if the dots were faintly glowing or if they just reflected the lights of the city.