VIDEO: A Detroit firefighter was trapped for hours as other firefighters rushed to get him out after a home collapsed. No major injuries were reported. Detroit firefighters believed they were dealing with a suspected serial arsonist. The same crew had been called to three vacant houses on West Hollywood Avenue just that week. On July 28, there was another fire the crew had under control from the outside. Then three veteran firefighters from the crew went inside to check for hot spots and to see if any people were inside. Local 4 investigators were told the first floor was dangerously unstable. The three firefighters were checking out the second level when they heard a crack. The floor collapsed right out from under them, all three falling down to the first floor.