At 09:37 Hrs. The 15 House along with Engines 9-1 and 5-1 were dispatched to 250 Mahoning St formerly Warshows in the borough for a working building fire. Chief 1501 (Gaugler) responded immediately and was advised by UCDES that PD was on the scene with fire and smoke showing from the first & second floors to the rear of the building. Chief 1501 immediately struck a 3rd alarm. Truck and Engine 15-2 responded at second dispatch. While Truck 15-1 was positioning on the west side of the building, Engine 15-2 began to drop a tail line from Mahoning St. down the east side of the building along the railroad tracks for the next incoming engine to complete a reverse lay to the hydrant. Engine 15-2 then advised Chief 1502 that they had interior operations and that they were pulling a 200’ 2" smooth bore. Chief 1502 radioed back with an immediate response that we’d need a bigger line. The crew from Engine 15-2 then pulled the 2 ½" with a smooth bore nozzle. As the crew was stretching in, Chief 1502 advised Capt.1506 that when you come in the door don’t turn left, and that I’m in a 3-4’ pit with a possible broken leg and arm injury. After the crew made it to the Chiefs location, he confirmed his injuries and advised us to make a hit on the fire. The crew then began to initiate a hit but due to water supply issues the crew could not. By this time, Truck 15-1 was setup and advised the Engine that they had fire though the roof of the C/D side. The Engine crew then called command 15 and advised they had a firefighter down with arm and leg injury and they were bringing him out the door and needed more manpower. Command 15 then requested EMS to meet us at the door and ordered an EVAC of the building. Command 15 then advised everyone it was now a defensive operation. By this time the rest of the apparatus was now arriving on the scene and multiple master streams were being placed in service. The fire was brought under control by 13:00 Hrs and crews still had multiple hours of overhaul. The demolition company that was working next door had a trachoe and were summoned to help tear down the building due to the stability. Crews began breaking down what they could and started to get their apparatus back in service. All Firefighters that were injured were treated and released. Engine 15-1 got a relief crew and remained on the scene until the trachoe was done. During the tear down the Engine encountered some more flare-ups and called for our Tanker and Tanker 9-1 with manpower back to the scene so they would not have to lay another 500’ of LDH. The 15 House returned to full service around 22:45 Hrs. Units on scene: ENGINES 15-2, 15-1, 9-1, 5-1, 12-1, 17-1, 4-1(transferred Sta. 2) SC 9-2, 7-2, 5-2, NC 741 TRUCKS 15-1, 9-1, SC 8-1, NC 542, LC 20 RESCUES 15-1, 2-1, 3-1, NC 735, 62,LC 13, LC 12 (transferred Sta.9) TANKERS 15-1, 91 EMS MICU 15, MICU 8, A8-1, A5-1, SC A8-5. SQUADS NC 5 REHAB NC 5-4. UTILITIES 15-1, SC 9-1 FIRE POLICE Co15, 17, 9, Point Twp, Sunbury & Milton Police Dept CHIEFS 1501, 1502, 1503, 902, 904