An oil rig exploded in Oklahoma late Monday, authorities said.
Beth Massey of the Blaine County Sheriff's Department said a perimeter was established around the site near Watonga, about 80 miles northwest of Oklahoma City.
KOCO-TV reported that the blast occurred at a drilling rig at around 10 p.m. local time.
"The flames were probably 100-feet tall," witness Matt Miller told KOCO. "Periodically, there were explosions with huge flashes."
Witness Maria Slay told The Oklahoman that she heard four or five explosions.
About a dozen workers were evacuated following a mechanical warning, KOCO reported. No injuries were immediately reported.
Watonga Assistant Fire Chief Verlen Bills told The Oklahoman that the cause of the blaze wasn't known. Several homes within a mile of the rig were evacuated.