Air Force officials are investigating after an A-10C Thunderbolt II fighter jet on a training mission accidentally fired a rocket near Tucson. Officials at Davis-Monthan Air Force Base say the M-156 rocket landed Thursday morning in a remote desert wash near Mount Graham.

They say there were no injuries, damage or fires from the accidental launch of the white phosphorus projectile in the Jackal Military Operations Area, which is about 60 miles northeast of Tucson. White phosphorus is used by the military in various types of ammunition to produce smoke for concealing troop movement and to identify targets.

A Fairchild Republic A-10 Thunderbolt II attack jet, belonging to the United States Air Force at Nellis AFB in Las Vegas, Nevada on Feb. 28, 2017. Larry MacDougal via AP

According to CBS affiliate KOLD-TV, the M-156 rocket weighs 23 pounds and is about 4.5 feet long.

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The A-10C Thunderbolt II was assigned to the 354th Fighter Squadron from the 355th Wing.