Firefighters knocked down a blaze that damaged a house in National City Tuesday morning, leaving residents and pets displaced, authorities said.

National City police and fire crews were sent to the single-family home in the 800 block of East 4th Street just after 9:30 a.m. to find the residence fully engulfed in flames with heavy smoke rising, OnScene.TV reported.

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Two cats were rescued from the house and the American Red Cross was assisting the displaced occupants.

No injuries were reported. The cause of the fire remains under investigation.

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