A firefighter was injured while responding to a fire in Milwaukee early Wednesday morning. The fire was reported around 2:00 a.m. near 38th and Vliet streets. It appears that the fire started in a mobile tattoo parlor parked outside a tattoo shop. Flames spread from the truck to the business and caused significant damage. Police told WISN 12 News that a firefighter hurt his ankle while at the scene. The cause of the fire is under investigation.