Crews spend 4th day looking for skydiver in Wash.

Associated Press
Rugged terrain surrounds the summit of Mount Si, upper right, Friday, Jan. 4, 2013, near North Bend, Wash. Searchers in the air and on the ground were looking for 29-year-old Kurt Ruppert of Lake City, Fla., who has been missing since a skydiving trip on Thursday. (AP Photo/Ted S. Warren)
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NORTH BEND, Wash. (AP) — Rescue crews spent their fourth straight day looking for a skydiver who vanished during a jump above Washington's Cascade foothills, but found no sign of the Florida man by dusk.

King County sheriff's Sgt. Cindi West says 100 searchers were out near 4,200-foot Mount Si east of Seattle early Sunday to find 29-year-old Kurt Ruppert of Lake City, Fla.

Ruppert hasn't been seen since he jumped out of a helicopter at 6,500 feet Thursday afternoon, wearing a special wing suit with fabric under the arms to allow him to glide like a flying squirrel.

Crews narrowed their search area Saturday, based on data from Ruppert's cell phone and the helicopter's flight path. It wasn't immediately clear whether the search would continue Monday.

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