Nate Murray, 4, holds a sparkler at a home in Scarborough, Maine, Wednesday, July 4, 2012. Sparklers, hot enough to burn some metals, are the No. 1 cause of fireworks-related injuries, warns the Consumer Product Safety Commission. In recent years some cities have banned sparklers on the Fourth of July..

Medical staff treated patients of all ages, ranging from 6 to 58 years old. All of the patients treated were males.