 News Center 7's Letitia Perry-Swatt was called to the scene where the man eventually gave up. We've now learned he may have used an explosive device to start that fire. A woman is critically hurt after a house fire on Charleston Boulevard this morning. Firefighters had to force their way into the house to save her. There were no smoke alarms in that house. You're a city of Dayton resident. You live in the city and your residence is in the city. We'll provide free smoke detectors, carbon monoxide detectors, and anything else of that nature that you may need.