COLUMBIA - The Columbia Fire Department responded to two structure fires early Monday morning. Firefighters were able to extinguish both of the fires, located in the 1500 block of Rosemary Ln. and the 2600 block of Quail Dr. One injury was reported at the Quail drive incident.  Fire investigators are at both locations. The fire department stated in a press release that fire investigators determined the origin of the Rosemary Lane fire was a closet in the second story bedroom. The cause of the fire remains under investigation. Damage is estimated at $50,000.  The press release also states that the origin of the Quail Drive fire was the kitchen in apartment B. The cause of the fire remains under investigation. Damage is estimated at $112,000.