Officials are working to determine what caused an explosion at a DeKalb County elementary school on Sunday morning. The call came in around 11 a.m. Someone reported an explosion at Hawthorne Elementary School, located at 2535 Caladium Drive. DeKalb County fire officials said there was damage to the school's roof and damage to concrete blocks on the side of the school. There were no injuries. CBS46 interviewed a nearby resident who said the explosion shook his home. There were several fire trucks and Atlanta Gas Light personnel in the area investigating the cause. Firefighters said the explosion may have happened in a boiler room behind the cafeteria. According to Atlanta Gas Light, a boiler at the school was not working properly. Once the school makes repairs to the boiler, an Atlanta Gas Light employee will complete a safety inspection.