Houston-based company Patterson-UTI Energy owns the rig.
The Occupational Safety and Health Administration (OSHA) has opened a federal investigation into the incident, according to Morris. Red Mountain Energy is a privately-held oil and gas exploration company based in Oklahoma City. The fire was extinguished Monday night.
The medical examiner's office has not investigated the deaths, as it also is waiting for the scene to be declared safe.
Morris said, "Most everybody was taken off the site and taken to a secure site here in Quinton", according to the Associated Press. One person was airlifted to a hospital, and five others remain missing.
Emergency officials said Monday they were letting the fire burn itself out and were fighting any flames that went beyond a perimeter they established.
The cause for the explosion is unclear at this time, authorities said. Say described Monday's accident as a first for the company and said his staff is "devastated".
Morris said it is most likely that the missing men were working in the doghouse or on the rig floor at the time the accident occured.
5 presumed dead after explosion at Oklahoma gas drilling rig
"Like you, the public and the media, we want to know what caused this terrible event, but today is not the time for these questions, at least not for me", Say said.
Say said the rig was about 13,500 feet into a scheduled drill of 17,00 feet. It is unclear if crews were drilling for oil or natural gas.
Morris said witness accounts claim the employees were working on a landing pad at the time of the explosion. "We're now providing support for the families and we're meeting with them to offer our deepest sympathies in this tragedy", said Andy Hendrick, President/CEO of Patterson UTI Energy. A similar explosion occurred at a nearby gas well past year.
"We don't want this to happen again for us or anybody in this industry", Hendricks said.
Authorities confirmed that 35-year-old Josh Ray's remains, along with four others, were found Tuesday, a day after the explosion at the drilling site near Quinton, Oklahoma about 100 miles southeast of Tulsa Monday morning.
The explosion and fire burned for several hours and sparked grass fires which fire fighters worked to contain.
Secondary explosions in the area caused Enloe and crew to back off the site.
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