A piece of machinery caught fire inside of County Materials Corp in Madison Saturday night, according to a news release from the Madison Fire Department. Crews found the piece of machinery on a 3rd floor mezzanine "fully involved" in fire when they responded just after 7:15 p.m. A sprinkler head activated and kept the fire contained until crews were able to extinguish it. The cause of the fire is under investigation and a damage estimate is not available at this time. Dane County Communications confirm there was a structure fire on Madison’s east side Saturday night. After 7:00pm, Madison Firefighters got an alarm for a structure fire near the intersection of Lexington and Commercial Avenues. Officials tell 27 News the fire department has since put out the fire, wrapping up its response and is clearing the scene.