A large crowd of people gathers ahead of the Boston Free Speech Rally in Boston, Massachusetts, U.S., August 19, 2017. REUTERS/Stephanie Keith

BOSTON (Reuters) - Hundreds of police officers were positioned around a Boston park where a group plans to hold a "Free Speech" rally with right-wing speakers on Saturday, a week after a woman was killed at a Virginia white-supremacist protest.

Thousands of counter-protesters who believe the event could become a platform for racist propaganda were gathering about 2 miles (3.2 km) away with plans to march on the rally.

Streets around Boston Common were lightly trafficked early on Saturday, while some 500 police officers placed barricades to prevent vehicles from entering the park, the nation's oldest. To keep the two groups separate, they also built a cordon around the site of the rally.

Last weekend's violent clashes in Charlottesville, Virginia, where one woman was killed in a car rampage after bloody street battles, ratcheted up racial tensions already inflamed by white supremacist groups marching more openly in rallies across the United States.

White nationalists had converged in the Southern university city to defend a statue of Robert E. Lee, who led the pro-slavery Confederacy's army during the Civil War, which ended in 1865.

A growing number of U.S. political leaders have called for the removal of statues honoring the Confederacy, with civil rights activists charging that they promote racism. Advocates of the statues contend they are a reminder of their heritage.

Duke University removed a Lee statue from the entrance of a chapel on its Durham, North Carolina campus, officials said on Saturday.

Organizers of Saturday's rally in Boston have denounced the white supremacist message and violence of Charlottesville and said their event would be peaceful.

"The point of this is to have political speech from across the spectrum, conservative, libertarian, centrist," said Chris Hood, an 18-year-old Boston resident who stood among a crowd of a few dozen people who planned to join the Free Speech rally. "This is not about Nazis. If there were Nazis here, I'd be protesting against them."

Last weekend's violence sparked the biggest domestic crisis yet for U.S. President Donald Trump, who provoked ire across the political spectrum for not immediately condemning white nationalists and for praising "very fine people" on both sides of the fight.

Beyond the Boston rally and counter-march, protests are also expected on Saturday in Texas, with the Houston chapter of Black Lives Matter holding a rally to remove a "Spirit of the Confederacy" monument from a park and civil rights activists in Dallas planning a rally against white supremacy.

Boston authorities also planned to put roadblocks in place to avert car attacks like the deadly one carried out in Charlottesville by a man said to have neo-Nazi sympathies against counter-protesters and a similar spate of attacks by Islamist extremists in Europe, most recently Barcelona.

COUNTER-PROTESTERS REJECT PLEA

Boston Mayor Marty Walsh had asked counter-protesters to avoid Boston Common, saying their presence would draw more attention to the far-right activists. He joined the crowd of thousands of counter-protesters assembling in Boston's historically black Roxbury neighborhood early on Saturday.

"These signs and the message so far this morning is all about love and peace," Walsh told reporters. "That's a good message."

Monica Cannon, an organizer of the "Fight White Supremacy" march, said it was a necessary move.

"Ignoring a problem has never solved it," Cannon said in a phone interview. "We cannot continue to ignore racism."

The Free Speech rally's scheduled speakers include Kyle Chapman, a California activist who was arrested at a Berkeley rally earlier this year that turned violent, and Joe Biggs, formerly of the right-wing conspiracy site Infowars.

Ron Villareale, a 71-year-old military veteran, stood by on the Boston Common wearing a tricornered hat and other garb common in 18th-century colonial times.

"We have too many extremists in this country," Villareale said. "If you don't agree with someone, ignore them."