"Deadly Plum House Explosion Traced to Internal Source, Fire Marshal Confirms"

The house explosion in Plum's Rustic Ridge neighborhood that killed six people last month originated inside the home, according to the Allegheny County fire marshal. The investigation has ruled out external factors such as wells, pipelines, and ground gas propagation. The cause of the explosion is still under investigation, and more information will be released when available. Homeowners are advised to install combustible gas detectors and to evacuate and call 911 and the gas company if they smell natural gas.