CHP crash investigation
A CHP officer blocks a lane near the remains of the motorcyclist at the crash scene. Photo credit: OnScene.TV

The California Highway Patrol is investigating a fatal crash in Lakeside early Sunday involving a solo motorcycle rider.

The crash happened just after 6:30 a.m. on State Route 67 at Slaughterhouse Canyon Road, but it is unclear what caused it, according to OnScene.TV.

The adult male motorcyclist was pronounced dead on the scene by medical personnel. The identity of the man has not been released.

The CHP issued a Sig alert following the crash and closed two lanes of the northbound highway.

Investigators also found a Smith & Wesson .38 revolver on the motorcycle, with the serial number number shaved off, according to OnScene.