A fire in a laboratory hood system brought Madison firefighters and the hazardous materials team to a North Side company Sunday evening, with nobody injured in the blaze. The fire was reported at about 6:35 p.m. at Covance Laboratories, 3301 Kinsman Boulevard, the Madison Fire Department said. "It is believed a spark from within a work station ignited some flammable chemicals, causing a chain reaction that results in a fire large enough to trigger the lab's automatic fire sprinkler system," said MFD spokeswoman Cynthia Schuster. A security guard also used a fire extinguisher on the fire, which was extinguished before firefighters arrived.