Gas Explosion At Pennsylvania Nursing Home Kills 2, Traps Many People Inside A gas explosion at a nursing home just outside Philadelphia triggered a plume of black smoke and trapped people inside the building, authorities said. "I saw smoke and I saw car after car after car was a fire truck or ambulance from all over the city, from all over," said State Rep. Tina Davis, whose district includes the center. She approached the scene in her car but did not want to interfere with response efforts