FALLBROOK (CNS) - An investigation was underway Thursday into a motorcycle crash near Fallbrook that killed a 40-year-old Los Angeles County man.

The Downey resident, whose name was not immediately available, apparently lost control of his 2014 BMW motorcycle while rounding a curve in eastbound Reche Road near Gird Road shortly after 11:30 p.m. Wednesday, according to California Highway Patrol Officer Jim Bettencourt.

His motorcycle struck a rock along the roadside, then a fence. Bettencourt said the rider was thrown onto a pile of broken up concrete and died at the scene.

It was unclear whether drugs or alcohol were factors in the crash, Bettencourt said.