On Thursday August 31st at 1147 hours, Frederick City units were alerted for a house fire in the 100 Block of South Market Street. Smoke was visible from a couple of the downtown stations, so a Rapid Intervention Dispatch was started immediately. Crews arrived to find a three story row home with fire in the rear and on two floors. There were also reports of people trapped in the building. Crews went to work on rescue and extinguishment efforts. C3-1 (DFC Dorsey) established the command and requested a 2nd Alarm. RS15 (Capt. Thews) responded on the first alarm as the rescue squad due to other units not being able to respond. E152 (DFRS Capt Yoder) responded on the 2nd Alarm. RS15 arrived and was immediately put to work on the interior to open up and extinguish any remaining fire along with a few other crews. Extension was found in adjacent buildings and in the roof, so there were extensive efforts made to open up the roofs of three buildings. E152 was also tasked with assisting with overhaul efforts. RS15 also assisted with setting up ventilation. The Co. 15 units also removed four cats from the affected buildings. The units remained on scene for nearly three hours before being released by command.