Police are trying to make sense of the shooting death Sunday of a well-known white-supremacist leader, allegedly at the hands of his young son.

Authorities believe the boy, whose age was not released, did not shoot his father by accident.

"We believe it was an intentional act,'' said Riverside police Lt. Ed Blevins.

Officials have not speculated about a possible motive.

Jeff Russell Hall, 32, was Southwestern regional director of the National Socialist Movement, a neo-Nazi group based in Detroit. Police were called to his home at 4:04 a.m. Sunday and found a badly injured Hall lying on a couch.

Paramedics attempted to revive Hall, but he died at the scene, Blevins said. After interviewing Hall's wife and five children, police booked a minor son on a homicide charge, he said.