Federal inspectors are blaming a fatal explosion at a West Virginia convenience store in part on a propane tank being located too close to the building.
The blast in January 2007 killed four people and injured six.
The U.S. Chemical Safety Board also found there was too little training for propane company technicians and for emergency crews.
The board's preliminary report said the 500-gallon propane tank was located next to the back wall of the store in violation of a 10-foot rule. The escaping gas filled the Flat Top Little General store in the town of Ghent before exploding.
The report recommends that emergency responders receive better training on how to handle propane leaks and that the state adopt training standards for propane handlers.