Authorities in Switzerland have suspended their search for an American extreme sports enthusiast missing in the Alps since Saturday.

Harrison Fast from Boulder, Colorado, was speed flying on the Jungfrau mountain in the Bernese Alps when the group he was with lost sight of him and alerted authorities.

A spokesman for Bern cantonal police said Tuesday that extensive air and surface searchers were undertaken for three days.

Christoph Gnaegi said the search was hampered by bad weather and dangerous terrain.

Gnaegi says "the active search has now been suspended."

Speed flyers launch themselves from slopes, using special parachutes designed to let them fly fast and close to the ground.