"It is only football. I never understood people who never understood that," the German boss said.
"It should never have happened and it should not happen in the future. We have to do everything to make sure things like that will not happen anymore."
"The game on Tuesday showed the beauty of the game during it - then it showed the most ugly face," added Klopp.
"It is common sense. Treat people how you want to be treated yourself."