The fire that sparked Wednesday night at a Fort Worth power substation is out and crews have left the scene, officials said Thursday morning. The substation erupted in flames hours before a winter storm hit North Texas with a forecast for inches of snow and sleet, officials with the Fire Department and Oncor Electric Delivery said.

Fort Worth officials have not yet revealed what caused an explosion at a power substation that led to a large fire.

At last check, Oncor was working on cutting power to the substation so fire crews can work on getting it under control.