US federal authorities have agreed to review the case of two Latino men shot dead by police in Anaheim.
The city's Mayor made the announcement after a fourth night of clashes between police and angry residents.
Meanwhile, the mother of an unarmed man who was shot by police officers has condemned violent protests against the killing, saying Wednesday she did not want them to become her son's legacy.
Her news conference followed a fourth day of violent protests over Saturday's police shooting of Manuel Diaz and the Sunday police shooting of another man who fired at police during a pursuit. A police dog escaped shortly after Diaz was shot Saturday and bit a bystander.
"I watched as my son took his last breath. I watched as his heart stopped beating for the last time," Genevieve Huizar said, breaking into sobs. "Please, please, please stop the violence. It's not going to bring my son back, and this is the worst thing any mother could go through."
In the latest wave of protest, as many as 600 demonstrators surged through downtown Tuesday night, smashing shop windows, setting trash fires and hurling rocks and bottles at police, authorities said.
Al Jazeera's Rob Reynolds reports from Anaheim in California.