The University of Southern California campus was put on lockdown, after shots were fired outside a campus Halloween party, injuring four people.
Witnesses say the shooting occurred during an overcrowded party at the center of the campus.
According to police, there were about 100 people outside the party when the gunman, who is not believed to be affiliated with the University, opened fire on one person hitting three others in the area.
Now word on the victims' conditions just yet.
Investigators believe the shooting is tied to a dispute unrelated to the school.
Police have two suspects in custody.