FONTANA, CALIF., JAN. 17 -- More than 250 people, heckled by racists, marched in a cold, driving rain today to honor the birthday of the Rev. Martin Luther King Jr. At least three white supremacists were arrested on weapons charges.

More than 140 officers lined the one-mile route that ended at the Fontana Performing Arts Center, where they stood guard for Martin Luther King III, the eldest son of the slain civil rights leader.

Members of the Ku Klux Klan, whose California leader once lived in the city, were among several dozen extremists who lined the march route in a frigid rain, some shouting white supremacist slogans. The so-called White Mafia and Aryan Youth Movement also were represented.

After the march, about 1,200 people filled the Performing Arts Center to hear King's son speak at an interdenominational service.

"I believe that my mission is to continue to get the message out there because I believe there are many more people out there who subscribe to the message of Martin Luther King than subscribe to the Klan's message," King said at a news conference before his speech.

"The reality is we are light years ahead of where we were in 1965," he said.