Mystery stranger vanishes after family says frantic warning saved their lives during devastating house fire

A mysterious stranger is being hailed as a hero after waking a sleeping Las Vegas family, helping them escape a predawn house fire and then disappearing before anyone could learn his name.

The family is now searching for the man they say pounded on their front door, screamed "Fire!" and even grabbed a garden hose to battle the flames before quietly leaving, hoping to thank the person they believe saved not only their lives, but their neighbors' lives as well.

The fire broke out shortly before 5 a.m. on July 5 at the family's home in the Las Vegas Valley. 

Home surveillance video shared with Fox News Digital shows flames engulfing the backyard as the fire spread.

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