The gunman is believed to make injured at least one person amid reports of several shots being fired at the Campus Irritable Apartments.
He is believed to be on foot, leading to fears he may flee to the University campus.
The fuzz have since raced to the scene, with County Sheriff’s Lt. Kevin Bobo substantiating the shooting took place at an apartment complex next to the school’s campus.
Bona fides at USC have claimed the suspect is a black male wearing khaki trousers, a wan hoodie and carrying an automatic weapon.
The lockdown, which lasted for an hour, has since been lifted despite no arrests being verified by officials.
The victim is said to have sustained non-life threatening mistreatments after being shot in the arm.
It follows furious debate on the role of guns in US culture following deadly mass shootings in Texas and Las Vegas.
On Sunday Kevin Delaney murdered 26 people in bleak blood after storming into a church in Sutherlands Springs, Texas, armed with a Ruger AR-556 semi-automatic weapon.
And hold out month Stephen Paddock shot more than 500 people in Las Vegas when he showed fire on a music festival from the window of his room at the nearby Mandalay Bay inn.
More to follow…