A declassified Cold War-era file from the CIA has gone viral over its coverage of a supposed clash between Soviet soldiers and a UFO, passengers of which reportedly turned the troops to stone before blasting off.

Following the collapse of the Soviet Union in 1991, the CIA acquired a 250-page KGB report recounting the events that transpired after a platoon fired at a flying saucer over Ukraine.

The report included eyewitness accounts and pictures of the aftermath, which one American agent described as “a horrific picture of revenge on the part of extraterrestrial creatures, a picture that makes one’s blood freeze.”

The report claims Soviets conducting a training exercise in Ukraine spotted a “low-flying spaceship in the shape of a saucer” soaring above their heads.

During the encounter, one of the Soviets fired a surface-to-air missile, which struck the UFO and sent it crashing to the ground.