This audio clip relays the "crazy" moment an "intruder UFO" was spotted zooming at high speed over the US state of Oregon.

Air traffic controllers were left baffled when the mystery object appeared on the radar - then chillingly disappeared without a trace.

Even F-15 fighter jets scrambled to intercept the bizarre sighting couldn't spot it.

Now audio tapes obtained by The Drive reveal the hours of confusion that ensued after the "white speck" zoomed across the sky on October 25 last year.

The alarm was first raised to Oakland Center Sector 31, near the border of Oregon at 4.30pm.

The object travelled over Crater Lake towards the Willamette Valley and was moving "very fast at 37,000 feet" when it was first spotted.

To read more, click here.

Category: Weird Desk