RIDDLE, Ore. -- A widespread search continued on Sunday for a Portland man volunteering with Cycle Oregon.
The race wrapped up in Sutherlin, Ore. on Saturday, but dozens of volunteers stayed behind to search for missing 54-year-old Mark Bosworth in Douglas County.
Nearly 2,000 racers passed through the town of Riddle on Friday, where Bosworth was last seen.
A Douglas County Sheriff's Office spokesman said Bosworth was a volunteer setting up and tearing down the "tent city" where cyclists camped overnight. He was last seen around 11:30 p.m. Friday returning from a beer garden, which was set up for cyclists in Riddle, Ore.
On Saturday, dozens of volunteers searched the area around the makeshift campsites, the nearby Umpqua River and brought in a specially-trained urban search dog. The dog is trained to search areas where large crowds have been.
A sheriff's office spokesman said he has received dozens of calls about the disappearance but said there's no indication of foul play or health issues.
According to Bosworth's blog, he calls himself a "dedicated bike rider" and is undergoing treatment for cancer, although investigators don't believe that is related to his disappearance.