Blaine County Sheriff's dispatcher C.J. Woulard said Tuesday morning that the fire was still burning -- but no injuries were reported.
County Sheriff Ricky Ainsworth told reporters that homes within a two mile radius were evacuated following the Monday night explosion about 80 miles northwest of Oklahoma City. Ainsworth did not immediately return a phone call for further comment early Tuesday.
Assistant Watonga Fire Chief Verlen Bills told The Oklahoman that the cause of the explosion was not known.
Witness Maria Slay told The Oklahoman that she heard four or five explosions and said workers are at the drilling rig around the clock.