According to the San Bernardino Police Department, the incident was not an active shooter situation and is likely gang-related. Police described the shooting as an isolated incident.
Investigators said one person was shot outside of the food court area around 1 p.m. after a fight occurred.
"A potential disagreement may have led to the altercation. This was NOT an active shooter situation and we have no reason to believe there are any threats to other patrons at the mall," police said in a statement.
The victim, who has not been identified, was rushed to the hospital. Police said he or she suffered non-life threatening injuries.
No one else was injured.
Police have not released information on a shooter or shooters and have not confirmed if any arrests have been made.
The shooting caused panic inside the mall among shoppers, with some running for cover or into stores to hide.
"All of a sudden we turned around and everyone was running toward the end of the mall," said shopper Veronica Henson, who was inside the mall's Foot Locker with her granddaughter.
San Bernardino police wrapped up their investigation after collecting shell casings in the parking lot.
The mall remained open amid the investigation, but some stores were closed and later reopened.