A driver jumped a curb and hit the three victims as they were walking in the area of Antonio Parkway and Oaktree Lane, south of Mission Viejo, around 4:15 p.m., according to the California Highway Patrol.
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The three victims were transported to a hospital, but the child did not survive. The two adults were being treated for serious injuries, said Thanh Nguyen of the Orange County Fire Authority.
UPDATE: Suspect, victims identified in Mission Viejo crash
The child's age and their relationship to the other victims is unclear.
CHP said the driver was arrested on suspicion of DUI.
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Footage from the scene showed the car with a damaged windshield that was stopped on an embankment next to the sidewalk.