Slow moving fireballs over Berlin on a hot summer evening.I was sitting on a bench in Friedrichstrasse in the centre of Berlin . It was dark. In the eastrn sky at approximatly 45 dgrees I saw two balls of fire processing across the sky at a slight upward angle. They were moving farly slowly and there was complete silence. They then disappeared from view behind a building. I would estimate their height at 2000 feet. I am not intrested in UFOs but have never seen anything like this. I have no obvious explanation. I am from the UK and I had not been drinking or taking any other substance.