One of Swedish House Mafia's final concerts as a touring act was overshadowed by death and violence in Dublin, Ireland on Saturday (July 7), with nine concertgoers suffering injury -- four of them at the hands of a knife-wielding assailant -- and one dying of a drug overdose.

Dublin police arrested a 23-year-old man after the show, charging him with stabbing four people during the concert. Three of the victims suffered serious injuries, and according to Spinner, "five additional fans were apparently wounded in a fight involving knives and broken bottles."

"Ticket holders entering the site were subject to a search permissible by law," insisted the promoter who put the concert together. "Every precaution, as far as possible, was taken to ensure the safety and security of the audience at all times ... there is only so much one can do to combat anti-social behavior."

Said "anti-social" antics also included the suspected drug overdose of a man in his 20s, who the BBC reports died during the show.

The concert's sad aftermath casts a pall over what was supposed to be a triumphant run of farewell dates for Swedish House Mafia, who announced their split a couple of weeks ago in a statement that read, in part, "We came, we raved, we loved."