LOS ANGELES, Calif. — The Board of Supervisors today offered a $10,000 reward for information leading to the hit-and-run motorist whose car fatally struck a 34-year-old mother of four in Lancaster.

At about 7:45 p.m. March 19, Simone Walker was walking across Avenue L near the intersection of 32nd Street East when a car being driven east hit her.

The speed limit in the area is 50 mph and a sheriff’s spokesman told the Daily News that the car was likely driving at least that fast.

Authorities searched through mounds of rubble Thursday in hopes of finding survivors of the huge, deadly explosion at a fertilizer plant that flattened much of a small Texas town.

The blast, which residents described as “massive” and “overwhelming,” left shattered homes and wreckage in a wide swath of West, Texas, a town of only 2,800 people.