COLTON, Calif. (AP) — Authorities have arrested the uncle and grandmother of a 2-year-old boy who was fatally mauled by as many as five dogs in San BernardinoCounty.

Colton police Sgt. Jim Jolliff says 23-year-old Marco Zamudio and 42-year-old Eustolio Zamudio were booked Tuesday on child endangerment charges.

Police say the attack took place about Monday in the backyard of a home in Colton, where the boy was staying.

Officers answering a call of a dog attack found the boy had been severely bitten on his upper body. He was taken to a hospital, where he was pronounced dead.

Jolliff says detectives were trying to determine how the boy, Samuel Zamudio of nearby Rialto, got out of the house.

Animal control authorities took five pit bull mixed breeds from the home.