A flying saucer from outer space crash-landed in the Utah desert in 2004
after being tracked by radar and chased by helicopters.

No space aliens were involved, however.

The saucer,
pictured above, was the Genesis sample return capsule,
part of a human-made robot
Genesis spaceship launched in 2001 by NASA
itself to study the Sun.

http://www.astronet.ru/db/msg/1235409/