A woman who allegedly fired pepper spray at other customers during a Black Friday sale has surrendered to authorities, Los Angeles police said Saturday. Police Sgt. Jose Valle said the woman who allegedly caused minor injuries to 20 shoppers at a Los Angeles-area Walmart turned herself in Friday night. ...

The incident was among those nationwide in which violence marred the traditional kickoff to the holiday shopping season.

In the most serious case, a robber shot a shopper who refused to give up his purchases outside a San Leandro, Calif., Walmart store, leaving the victim hospitalized in critical but stable condition. Police in San Leandro, about 15 miles east of San Francisco, said the victim and his family were walking to their car around 1:45 a.m. Friday when they were confronted by a group of men who demanded their shopping items. When the family refused, a fight broke out, and one of the robbers pulled a gun and shot the man, said Sgt. Mike Sobek.

Meanwhile, police in suburban Phoenix came under fire when a video was posted online showing a 54-year-old grandfather on the floor of a Walmart store with a bloody face, after police said he was subdued Thursday night trying to shoplift during a chaotic rush for discounted video games. ...

In Sacramento, Calif., a man was stabbed outside a mall Friday in an apparent gang-related incident as shoppers were hitting the stores. The victim was taken to a hospital with non-life-threatening injuries, police said. The stabbing stemmed from a fight between two groups around 3 a.m. in front of a Macy's department store at the Arden Fair Mall.