A family of six was awakened by their two dogs after a fire broke out in their Lawrenceville home.

Once the two adults and four children had safely escaped, they called 911 around 3:40 a.m. Sunday, according to Gwinnett County Fire and Emergency Services. Firefighters found the two-story Appian Way home with heavy smoke “billowing” from its second floor and fire breaking through the roof of an above-the-garage living space, according to a department release.

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Firefighters were able to subdue the flames with an “aggressive interior fire attack,” the release said. While the space above the garage, second floor and attic sustained heavy damage, an addition to the back of the house only sustained minor damage.

An investigator found that the fire began outside the house, near a trash can. The cause has not yet been determined and is still under investigation. No injuries were reported, including the two dogs.

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The threats came in around 12:30 p.m. on Sawanee Avenue, police said.