One of the dead suspects is female. But there is no information about their ethnicity.
There is a house in Redlands about to be entered by law enforcement. They must know who lives in the house. They are keeping this info from us.
Also, the fact that someone left the party in anger may be a red herring, just a coincidence. (Which makes sense. Who has a bunch of guys with guns sitting out in the parking lot waiting to commit mass murder in case they get mad at a party?)