LAS VEGAS -- Authorities are investigating the sinking of a yacht owned by Las Vegas entertainer Wayne Newton at a marina.

National Park Service spokeswoman Christie Vanover said Monday that the 20-metre vessel sank stern-first in 13.7 metres of water while it was in a slip at the Temple Bar marina. That's on the Arizona side of the Colorado River reservoir, about 128 kilometres east of Las Vegas.

Vanover says no one was on the boat, and no injuries are reported.

Newton's sister-in-law, Tricia McCrone, confirms that the 1996 Skipperliner named Rendezvous belongs to Newton.

McCrone says Newton and his wife were vacationing when the boat sank Friday.

A photo provided by the Park Service shows the boat's bow sticking straight up from the water.