SOUTH COBB — Authorities are investigating a Sunday morning two-alarm fire that heavily damaged part of a south Cobb shopping center. The fire, reported just after 5 a.m., started in a unit that houses both a Western Union money transfer facility and an insurance office in the Clay Plaza shopping center at 4975 Austell Road,

Cobb Fire Lt. Dan Dupree said. The fire also heavily damaged an adjoining DUI school and a chiropractor’s office. Some of the center’s other businesses suffered smoke damage. No one was at the shopping center, located just north of Austell, at the time of the fire, Dupree said. Extinguishing the blaze took 17 units with 45 firefighters less than an hour.

Other businesses in the shopping center include a carpet store and three churches. “It’s been there a long time,” Dupree said of the shopping center.

The cause of fire is still under investigation, Dupree said. While Georgia Power had cut power to part of the shopping center, he said the part farther away from the fire would likely see little impact.