Original story (9/21): Skrillex and Diplo teamed up this year to give us great joy in the guise of Jack Ü, that EDM superduo behind the Justin Bieber collaboration "Where Are Ü Now." (Don't confuse it with the Biebs' history-making chart-topper/career revitalizer "What Do You Mean?")
But a recent Jack Ü show ended in horror for some attendees. TMZ has discovered that a Labor Day weekend performance in Las Vegas saw four people "seriously stabbed" when "a huge fight involving around 20 people broke out in the middle of the show." Officials arrested a suspect now facing three charges of attempted murder.