Shoppers and employees have since described terror and chaos when the shots rang out.
Shrieks from inside the store were heard on video recorded by shopper Nikki Tate, who had stopped by with her daughter to pick up steaks and lobsters for Father’s Day.
Tate said Saturday she was by the meat section when she heard ‘about six or seven shots’.
She dropped to the ground and crawled toward her daughter who was at the other end. They huddled until they were able to escape through a side door.
‘I saw people and heard shots and my first thought was ‘Jesus, is this another mass shooting?” she said.
‘I didn’t know if this was a random thing or a domestic thing or if this was a mass shooting. Everything was happening so fast, I just wanted to get me and my kid to safety.’ In the video, her daughter says, ‘Mommy, we need to go.’

Chaos: Purses, cellphones and backpacks were left inside the store as panicked shoppers fled the Corona Costco shop on Friday night

Meanwhile, Christina Colis told the Riverside Press-Enterprise that she was in the produce area when she heard six to seven shots and hid with other shoppers in a refrigerated produce room.
She said her mother saw people injured on the floor.
‘I thought maybe someone dropped a bottle of wine, but then I kept hearing shots,’ shopper Will Lungo told the Press-Enterprise newspaper.
‘An employee came in and helped us out through the emergency exit.’
Witnesses told KCAL-TV that shoppers and employees rushed to the exits.
The station reported that more than 100 people were outside the store at one point.
Police said purses, cellphones and backpacks were left inside the store as panicked shoppers fled.
The official police report from Corona PD states: “Without provocation, a male unknown to the officer’s family assaulted the officer while the officer was holding his young child,” according to the Corona police statement. “This attack resulted in the officer firing his weapon, striking the male and two of the male’s family members. “The two wounded family members, later identified as the dead man’s parents Russell and Paola French, were hospitalized in critical condition Saturday, officials said.
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The involved officer, whose name was withheld, was treated for minor injuries at a hospital and released a short time later. It was unclear what type of injuries he suffered or how he was assaulted. Police made no mention of any weapons used by the alleged attacker.
“The officer’s gun was the only weapon involved in the incident, contrary to earlier reports,” the Corona police statement said.
“As is standard procedure in such investigations, the Corona Police Department is working closely with the Riverside County District Attorney’s Office who will be evaluating the facts and circumstances of this incident.”

The statement by Corona police did not accuse the victim’s parents, both of whom were also shot and critically injured by the off-duty officer, of any wrongdoing.
No arrests had been made Saturday, though the officer was initially detained as a possible suspect early in the investigation.
“The Department has initiated an Administrative Investigation and is working with the Corona Police Department to learn more about the incident,” the LAPD said in written