LAWRENCEVILLE, Ga. – Gwinnett County firefighters were on the scene of a house fire in Lawrenceville, Tuesday afternoon.

The fire was in the 600 block of Old Johnson Ferry Road.

Crews arrived to find a two-story house on a basement with heavy flames showing from the back and in the attic. They were also met with fire showing from the exterior wall and attic of a neighboring house to the left of the original fire building.

The blaze caused heavy damage in the first house and moderate to heavy damage in the attic and part of the main-living space in the second house.

The exact cause of the fire is currently undetermined. Fire officials say the blaze appears to have started in the area of the back deck on the first house and is under investigation. One witness reported seeing a small fire underneath the deck and called 9-1-1 as the fire quickly spread.

The American Red Cross was contacted to provide temporary assistance for those displaced.

Firefighters rescued two dogs and two cats from inside the first house. The animals were taken to a nearby animal hospital by a neighbor. Two additional cats were found deceased inside the home. No human injuries were reported.

Occupants of the second house were at home when the fire erupted and escaped unharmed. They were alerted after seeing flames burning up the back of the neighbor’s house. The man said that by the time he got his family out, the flames had already spread to the side of his house.

PHOTOS: House fire in Lawrenceville