A young boy has become the fourth fatality after a motoristslammed into a crowd outside a California church.
Samuel Gaza, 6, died from his injuries in hospital. His mother, Martha Gaza, also died after the incident.
The driver, Margo Bronstein, is expected in court on charges of vehicular manslaughter and suspicion of driving under the influence.
Ms Bronstein drove into a crowd and another car outside a church, injuring a dozen people including five children.
"Someone ran the red light, and bodies started flying. It was pretty horrible," witness Marco Zonno told a local television station.
Ms Bronstein, 56, sped around another vehicle at a red light and struck the crowd before hitting another car, police say.
Victims suffered broken bones, abrasions and head trauma. Mary Anne Wilson, 81, and Saeko Matsumura, 87, also died.
Those in the crowd had left a Christmas programme at St James Catholic Church in Redondo Beach.
Ms Bronstein is being held on $300,000 (£191,546) bail and is expected to appear in court either on Friday or Monday.