I'm actually Bulgarian and I guess I'll fill you guys in on the whole story.
The "assassin" is a student with Turkish roots who decided to show to the old dude ( Ahmed Dogan ) that he's not untouchable and that he cannot control the Turkish people living in Bulgaria. No assassination was intended, the idea was just to scare the guy. The gun itself is a gas gun and it was without a magazine.
Now, our "assassin" is going to sue everyone who beat the crap outta him.