East European cars abandoned in my street?

I live in The Netherlands and in my street I have seen a lot of east european cars, Czech, Poland, Bulgaria and Serbia mostly that have been abandoned and just stay there, after some months they get a warning paper on the car and eventually get taken by the government. Does this mean those people died or what? Cause I am confused. There has been a shooting lately in my city between Bulgarians and Serbians, perhaps those cars belonged to them? I don't know. What could be other reasons why people would abandon their car?