Wilfredo Arevalo, a rancher, saw a huge disk land, another hovering above.
He got to within 500' of the landed UFO, which was giving off a greenish/blue vapor and an intense smell of burning benzene.
Above the saucer, a large flat disk was rotating, like a phonograph record.
In the center was a transparent cabin, he could see 4 tall men with pallid faces, dressed in cellophane, working at instruments.
Then the craft shone a searchlight on him, it lit up with blue light, and it rose up, emitting red & green flames and a faint hum.
Both craft sped off, leaving bluish trails.
Next day burnt grass was found at the site.
Several other witnesses to the UFO in flight.