LIVERMORE (CBS SF) — A fire swept through a house in Livermore Friday morning and claimed the lives of a resident and a pet dog, fire officials said.

Livermore-Pleasanton Fire Department said firefighters responded at around 5:09 a.m. to a single-family detached home on the corner of Westminster Way at Lambeth Rd. near Vista Meadows Park. They found a large fire in the garage that had extended into the home.

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Firefighters found a male resident inside the home and brought him outside where medics began life-saving measures. Despite the efforts, the man was pronounced dead at the scene, the fire department said.

A dog was also found deceased inside the home. No other occupants were reported or found inside the home.

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The fire was brought under control within about 30 minutes. There were no injuries to firefighters.

The fire caused significant damage to the house, with initial loss estimate of $400,000, the fire department said.

There was no immediate word of what caused the fire.

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The Livermore Police Department was working with the Livermore-Pleasanton Fire Department in investigating the cause of the fire.