Two children are dead and their mother is behind bars suspected of driving under the influence following a crash in Napa Sunday morning, the California Highway Patrol said.

A good Samaritan, who was helping out another driver, was killed in a suspected DUI crashes Sunday morning. The California Highway Patrol responded to Highway 99, north of the westside Boulevard in Atwater of a reported seperate crashes.

The crash site sits along a bustling corridor for traffic heading onto the highway or deeper into Napa, with a gas station to the north and a park-and-ride to the south. The offramp, lined with scattered trees and plants, was shut down until noon as investigators worked to determine how fast the sedan was traveling before impact.

Law enforcement officials are warning drivers Monday not to count on luck to steer clear of trouble if they decide to drink and drive on Saint Patrick's Day.

Law enforcement officials are warning drivers Monday don’t count on luck to steer clear of trouble if they decide to drink and drive on Saint Patrick’s Day. That was the message from the San Diego County Sheriff’s Office on Friday as it announced plans for 12 hours of increased sobriety patrols to reduce roadway dangers on the holiday,