A San Bernardino County woman was mauled to death by a pack of pit bulls.

The Sheriff's Department says deputies were called to a home in Yermo at around 9:30 p.m. Tuesday. They found 45-year-old Kelly Caldwell lying in the street. She later died at a hospital.

Authorities say three dogs surrounded and attacked Caldwell, then ran to a nearby house.

One dog was shot to death by deputies when it returned to the scene and acted aggressively as paramedics were trying to save Caldwell's life.

A second dog was shot to death Wednesday morning when it, too returned. Deputies say it became aggressive as an animal control officer was trying to capture it.

Authorities say at least one dog belonged to a neighbor. No arrests were immediately made.