The Associated Press

GRINDSTONE, Pa. — Fire broke out at a natural gas well Tuesday, injuring six people and leaving at least two in serious condition with burns, officials said.

"It's a very serious situation, but they do have it under control," said Roy Shipley Jr., Fayette County emergency management director. Crews planned to cap the well, about 30 miles south of Pittsburgh, once the fire was out.

Jeffrey Simmons, executive vice president of operations for Atlas America Inc. of Moon Township, an oil and gas production company, said he understood from the workers that something had produced a spark.

County emergency dispatchers said two of the injured workers were in serious condition with burns, and the other four were in stable condition.