Witnesses told CBS affiliate KCAL-TV that a man with a Mohawk haircut was arguing with a woman with a child inside the store when about eight shots rang out. One succumbed to their injuries at the scene while the other three were rushed to the hospital, the Corona Police Department said.
"Upon entering Costco, officers located four injured people on the floor".
The man responsible for the fatal shooting was apprehended with injuries and was taken to a nearby hospital by authorities, police report.
The suspect was not identified but told officers at the scene after he was taken into custody that he had been injured, though no details were immediately available today on how he was hurt.
On Saturday morning, the Corona police released a follow-up statement advising those who left behind personal items to retrieve them from the department.
The shooting took place at the N. McKinley Street Costco store in Corona, a city in Riverside County, at around 7:45 p.m local time. They said an off-duty officer from another agency was injured in the shooting.
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Tate said Saturday she was by the meat section when she heard "about six or seven shots".
"It's not very fun when you're scared and you're running for your life and you're trying to open a door that says "emergency" and they don't open", witness Rochelle Flores told KTLA.
Police have not given a motive for the shooting or said if the suspect and victim knew each other.
Witnesses told KCAL-TV News that gunshots were fired after an altercation inside the store.
Shoppers and employees described terror and chaos as the shots rang out. "An employee came in and helped us out through the emergency exit".
"I thought maybe someone dropped a bottle of wine, but then I kept hearing shots", Lungo said.