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Four oilfield workers were injured in an oil well explosion Wednesday morning.

The Eddy County Sheriff’s Office said the workers were conducting maintenance on the well when a seal failed.

Reports said the well belongs to Apache Corp.

A pipe released down the well created back pressure of air and crude oil. When the pressure released, it returned to the surface at a high pressure, injuring the workers, KOB4 said.

One of the workers was flown to a hospital in Lubbock, Texas, for treatment.

The three other workers were treated locally.

New Mexico State Police are investigating whether a hazmat release took place during the explosion, the report said.

Companies involved also sent safety personnel to assist in the investigation.