BARSTOW, Calif. (AP) — A pack of pit bulls surrounded a woman and mauled her to death, authorities said Wednesday.

Police found Kelly Caldwell, 45, lying in the street around 9:30 p.m. Tuesday, and took her to a hospital, where she later died, the San Bernardino County Sheriff's Department said.

After the mauling, the dogs ran to a nearby house. Deputies shot one dog to death when it returned to the scene and acted aggressive as paramedics were trying to save Caldwell's life, authorities said.

A second dog was shot to death Wednesday morning when it too returned.