According to a fire marshal, flammable fumes from oil that remained in a storage tank is what was the cause for the well blast that killed two workers.

The explosion occurred at a well near Pittsburgh owned by Huntley & Huntley Inc. in late July. The well produced methane gas but used oil out of the ground in order to do so. The leaky tank where the oil was stored was emptied before welders were working near it but because it was hot day vapor began to fill the tank.

The welders were working to repair the tiny holes when a spark ignited the vapor. The tank than rocketed over 100-feet in the air. Officials from the federal Occupational Safety and Health Administration are investigating this fatal workplace accident.

Workplace accidents can cause serious injury and change the lives of many people, our condolences are with the friends and family of the victim.