A fire involving nine vehicles broke out Wednesday afternoon in the parking structure at Froedtert Hospital in Wauwatosa, prompting firefighters to search the area for staff and visitors. The fire was reported at about 12:14 p.m., according to the Wauwatosa Fire Department. One person was injured and went to the emergency room on their own, the department said. Firefighters worked to extinguish the blaze. The cause remains under investigation.