A mother whose two children were killed when she crashed her car into a tree in Napa early Sunday was arrested on suspicion of driving under the influence of drugs or alcohol, authorities said. A 10-year-old boy and a 9-year-old girl were pronounced dead at the scene shortly after California Highway Patrol officers responded to a 911 call reporting the crash near Highway 29 at the Imola Avenue offramp around 7:20 a.

Two children are dead and a driver was hospitalized Sunday morning after their car crashed into a tree off a Highway 29 offramp in Napa, authorities said.