PALMDALE, Calif. — The eighth edition of the Tour of California begins two days of racing in Los Angeles County today with a 110.3-mile stage from Palmdale to Santa Clarita.

The 121 cyclists will leave from Marie Kerr Park at 11:20 a.m. for a stage that will feature racing through the hills north of Santa Clarita along San Francisquito Canyon and a 22-mile climb up Lake Hughes Road, followed by a gradual 18-mile descent down Spunky Canyon and Bouquet Road.

LITTLEROCK, Calif. — An investigation was underway today into the death of a 63-year-old woman who was mauled by pit bulls as she jogged in Littlerock, near Palmdale.

The woman, identified by the county coroner’s office as Pamela Devitt of Littlerock, was attacked about 9:30 a.m. Thursday near 116th Street East and Avenue S, authorities said.

Supervisor Mike Antonovich said in a statement that “four killer pit bulls” mauled Devitt.