A woman was hospitalized Saturday after part of a roof outside an Office Depot in South Austin collapsed and landed on her, officials said.

The woman, a store customer in her 20s, was walking out of the front entrance of the store at 2101 S. Lamar Blvd., near Oltorf Street, around 2:58 p.m. when the ceiling above her broke away from the main building, authorities said.

Another customer alerted employees of the incident and they called 911, said store manager Mark Turner.

"She had just finished shopping with us and was walking to the (CVS Pharmacy next door), and that’s when it collapsed," he said.

Turner said he did not know how long the store may be closed due to the structure damage.

The woman was taken to St. David’s South Austin Medical Center with potentially serious — but not life-threatening — injuries, Austin-Travis County EMS officials said.

About 12 customers and employees were in the store at the time of the incident and they exited through the back of the building, Turner said.

Part of the ceiling was still hanging from the structure Saturday evening.

Kevin Dixon, Austin Fire Department battalion chief, said firefighters were waiting for the Office Depot regional manager to arrive at the store to get permission to remove the hanging pieces so that there is no further hazard.

The cause of the collapse is unknown, he said, but it appears that the weight of the ceiling was too heavy for the nails used and they pulled loose from the wood.

"Our recommendation is going to be that the store stay closed because we’ve evaluated up in the attic and the rest of that ceiling is coming down off of the wood as well," he said of the remaining portion of the ceiling that hangs over the outside sidewalk.