A Roswell apartment fire that started Friday morning quickly spread to 20 units, displacing as many as 40 tenants, fire officials said.

The fire began just before 8:20 a.m. at the Wood Creek apartment complex on Holcomb Bridge Road, according to the Roswell Fire Department.

The fire engulfed much of the building by the time firefighters arrived on the scene.

One dog was rescued from the blaze and no injuries were reported.

The Red Cross estimates 40 people were affected by the fire and has sent disaster workers to the apartment complex.

“Volunteers are providing emotional support and assistance for immediate emergency needs like lodging, food, clothing, toiletries and replacement medications for the approximately 40 people affected,” Red Cross spokeswoman Ashley Henyan said. “In the days ahead, caseworkers will follow up with families to share recovery resources and help them get back on their feet.”

It remains unclear what caused the blaze, but motorists are asked to avoid the area while fire crews investigate.

In other news: 

Police are working to identify the woman.