A man opened fire in a grocery store Sunday afternoon, hitting and injuring his girlfriend and her sister before police shot him to death, authorities said.
The suspect arrived at the Rio Ranch Market in Chino at about 1 p.m. with his two young children in tow, Chino Police Lt. Al Cheatam told reporters at the scene.
He shot at four people inside, including his girlfriend, who worked in the store's bakery.
"At first everyone thought it was a balloon that went off in the store," Fabio Cebreros, a customer in the store, told KABC-TV.
"But then after you heard two more shots just randomly go off, POW! POW! It was chaos."
Police said when they confronted the shooter, he was holding his girlfriend hostage.
"She had been shot, we could tell that by her bleeding, and he was holding her in a position where he had his gun to her head," Cheatam said. "One of our officers was able to get a good line of sight between him and the hostage and the shooter, and we were able to resolve the situation by the officer firing a round at the suspect."
The girlfriend's sister was airlifted to a hospital in critical condition, authorities said.
The girlfriend was treated for non life-threatening injuries.
It was unclear if the sister also worked at the store.
Police would only identify the gunman as a 25-year-old, and they did not immediately release the identities of the victims.
The two children were in custody of Child Protective Services, authorities said.
Chino is about 40 miles east of Los Angeles.