Five pit bull terriers mauled to death a two-year-old boy at his family home in the United States.

Jacob Bisbee opened the garage door at the four-bedroom house in Concord, California, and was immediately savaged by the pack of dogs.

Police said the toddler suffered "very severe" injuries and was pronounced dead in hospital.

His grandfather Steven Hayashi, 52, who was not at home at the time, has been arrested on suspicion of child endangerment and owning dangerous animals.

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