(AP) - Authorities in Nevada are trying to find out why a yacht owned by Wayne Newton sank.

It happened at a marina in Lake Mead, Nevada. A spokeswoman for the National Park Service says the 65-foot vessel went down stern-first in about 45 feet of water. The boat was in a slip at the Temple Bar marina, located on the Arizona side of the Colorado River reservoir. No one was on the boat - and there were no injuries reported.

Newton's sister-in-law confirms the boat belonged to the Las Vegas entertainer. But she says Newton and his wife were vacationing out of the country when the boat sank this past Friday.