UFO during wintertime 1993/1994 in Chemnitz/Germany.

Winter 1993/1994, Clausewitz Strasse, Chemnitz, Saxony, Germany about 18:00h.  Everything was like a usual winter day:  We were 2 kids playing in a high populated area in Chemnitz.  It had snow so we were out and enjoyed our winter holidays.  Roads were busy with people who came from work.  It was already dark. 
From one to the other moment everthing was quiet.  Lights were switched on (more than before) in the residental blocks around us.  
A flying object flow about 50m away from us.  It wasn't easy to see which shape it had but we saw 7 lights on it.  Those lights changed colores all the time.  There was still no voice around us, no people around us, no cars on the road, nobody looked out of windows. 
The craft flew straight from east to west from one block to the other in about 20 seconds (about 50 meters).  We couldn't believe what we had seen. 
After a while everthing was like before.  People came home, cars drove in the street...  Nobody believed what we had seen. 
I'm n! ow 26 years old and work as a aircraft engineer.  I still have no idea what it was.
Date in 1993/1994 is approximate.  PD