Four injured in University of Southern California Halloween party shooting

At least four people have been injured in a Halloween party shooting on a US university campus (Andres Rodriguez)

At least four people have been injured in a Halloween party shooting on a US university campus, it has been reported.

One suspect has been detained and police confirmed that there were casualties. A news blog based at the University of Southern California called “Neon Tommy”, said the shooting took place there at 23.30 local time.

Witnesses reported a “mob” fleeing. One told the Los Angeles Times: “Everyone started running. I saw a guy who was shot in the leg. He was limping and screaming for his friends to help him. People were screaming and running away.”

Writing on Twitter, one user whose geolocation tag placed him in the area, said: “University Park Campus is on lockdown - no one going in or out. Four victims, and emergency personnel everywhere.”

Another wrote: “This is sad. Music is still playing as if people didn’t get shot.”

The university’s Department of Public Safety issued alerts asking students to stay away from the area, stay indoors and avoid opening the door to strangers.

According to reports by students, classes are to resume tomorrow.

In 2008, University of Southern California sprinter Bryshon Nellum was shot in the leg three times at a Halloween party just off the campus. He recovered and won a silver medal in the 4 x 400m relay at the London 2012 Olympics.