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Two in custody after shooting at University of Southern Calif.

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LOS ANGELES — Two people are in custody after four people were shot at a Halloween party at the University of Southern California.

The university posted an alert on its website asking students to take shelter after the shooting took place around 11:30 p.m. Wednesday “in the area of Tutor Campus Center on the University Park campus.”

Later, the university posted an update saying a suspect had been arrested and that no students, staff or faculty were involved. 

Capt. David Carlisle with the university’s department of public safety told CNN the shooting occurred during an argument between two men at a Halloween party. 

The man who was shot in the argument was critically wounded, while three bystanders were taken to the hospital with less serious injuries.

The Los Angeles Times reports the violence occurred outside the party, which was attended by about 100 people.

University officials said classes will resume in the morning.