They Were Shopping at Costco. Then, 'Pop, Pop, Pop'

An argument at a Southern California Costco turned deadly Friday evening, with a suspect now in custody. The AP reports one person was killed as a result of the altercation, while a release from the Corona Police Department notes three others were injured from the gunfire, including an off-duty officer from another agency. CNN reports one of the injured was the gunman himself, and Corona PD Lt. Jeff Edwards says other people were hurt during the terror-driven stampede of shoppers trying to escape the store. The conditions of those hurt aren't yet known, and police aren't releasing the identity of the deceased person until the next of kin has been notified.

Witnesses tell KCAL, via the AP, that a man with a Mohawk was seen in a tiff with someone near the frozen-foods section when he pulled out a firearm and got off at least six shots. Edwards notes the person killed was one of those involved in the argument. "I heard pop, pop, pop," one witness tells KABC, while a couple shopping for barbecue supplies tells KTLA they and other shoppers had trouble getting out of the store's emergency exits. "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," Rochelle Flores says, adding she hurt her hand trying to pry the door open. Her companion notes they had to find their way to the front entrance to get out instead. (More shooting stories.)