What happened in a Arizona Night club?

There was a shooting in an Arizona night club. 14 people were hurt. The suspect is kept in custody being held on 13 counts of aggravated assault and 1 count of assisting a criminal street gang. 

Night club+ shooting people = x_x

It was a nightclub and nightclubs are associated with gangs, no good can come out of it. Don't go to a nightclub, apparently you could get shot.