| The blast occurred around 6:45 a.m. local time at Chevron 
				Appalachia's Lanco 7H well in Dunkard Township, about 50 miles 
				south of Pittsburgh.
 				"One employee of a contractor is currently unaccounted for and 
				another contractor employee was taken to the hospital for minor 
				injuries and has since been released," Chevron spokesman Kent 
				Robertson said in an email.
 				The Lanco well pad has three natural gas wells. Nineteen workers 
				were on the well pad during the explosion, Robertson said, 
				adding a fire continued to burn.
 				"At the time of the incident, preparations were being made to 
				run tubing, which is often done prior to bringing wells into 
				production," Robertson said.
 				There was no drilling or hydraulic fracturing at the time, he 
				said.
 				Robertson said the company did not immediately know the cause of 
				the explosion. Wild Well Control, an organization trained 
				specifically to deal with natural gas explosions, was on site, 
				he said.
 				"Chevron's primary concern at this point is to contain the fire 
				and ensure the safety of its employees, contractors and the 
				surrounding community," Robertson said.
 				(Writing by Ian Simpson and Eric M. Johnson; 
	editing by Edward 
				McAllister and Chizu Nomiyama) 
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