BOULDER CITY, Nev. — An official says a search is on for a missing boater after his 25-foot sailboat was found floating unattended at the Lake Mead reservoir on the Colorado River.

Lake Mead National Recreation Area spokeswoman Christie Vanover said Monday that 69-year-old Brian Yule of Las Vegas was last seen about noon Friday leaving the Callville Bay Marina on his blue and white 25-foot boat.

Yule was reported missing Saturday morning, and a Nevada Department of Wildlife game warden found the boat a few hours later.

Vanover says National Park Service and Las Vegas police are also taking part in the search.