One person is missing and another was injured in an explosion and fire Tuesday at a natural gas well in southwestern Pennsylvania.

The blast happened Tuesday at 6:45 a.m. at Chevron’s Lanco 7H well in Dunkard Township, Greene County, Pennsylvania.

Chevron spokesperson Kent Robertson sad the company “did not immediately know the cause of the blast,” according to Reuters.

The well is about 50 miles south of Pittsburgh and near the border of West Virginia.

Drilling began on the horizontal well in March 2012, Bloomberg said.

Five horizontal rigs drilling gas wells were in Greene County as of last week, according to Baker Hughes.

Chevron’s acreage in the Marcellus shale formation ranked third largest in September last year, Bloomberg said.

Chevron said the fire at the well was contained and Wild Well Control, a gas-well fire specialist firm, was on the scene.

“One person was taken to the hospital to be treated for injuries, and rescuers continued to search for a person who was missing, a Greene County dispatcher said,” according to Reuters.


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