Boston Crowd of Anti-Racists Dwarfs 'Free-Speech' Rally (+Video, Photos)

About 25 conservative rally-goers gathered on Saturday at Boston Common Park, but abruptly left about 90 minutes after the event started.

Al Jazeera's Shihab Rattansi, reporting from Boston, said thousands jeered as the group was "escorted out" the park by police officers, Al Jazeera reported.

According to reports, an estimated 15,000 people showed up at the counter protest.

They chanted anti-Nazi and anti-fascism slogans, and waved signs that said: "Love your neighbor", ''Resist fascism" and "Hate never made US great".

Others carried a large banner that read: "SMASH WHITE SUPREMACY".

One of the planned speakers of the "free-speech rally" was quoted by AP news agency as saying the conservatives' event "fell apart".

A number of far-right activists had been asked to speak at the event, but some dropped out, according to local media.

Far right groups often use the guise of free speech to incite hatred.

Police had deployed 500 officers - some in uniform, others undercover - to keep the two groups apart.

Many had feared violence after an August 12 rally in Charlottesville turned deadly. Then, a white supremacist mowed down crowds of people, killing 32-year-old anti-racist protester Heather Heyer and injuring dozens.

The Boston Free Speech Coalition, which organized the event, said it has nothing to do with white nationalism and is not affiliated with the Charlottesville rally organizers.

Samson Racioppi, a Libertarian Party congressional candidate from the US state of Massachusetts, was slated to speak on the "free-speech" stage.

He told WCVB-TV he did not realize "how unplanned of an event it was going to be".

Earlier, he said that when free speech is "suppressed", the only recourse "extremists will have remaining is [sic] terrorism and violence".

Kyle Chapman, who described himself on Facebook as a "proud American nationalist," had also announced his attendance.

Mayor Marty Walsh had pointed out that some of those invited to speak "spew hate".

Saturday's showdown was mostly peaceful, and after demonstrators dispersed, a picnic atmosphere took over with stragglers tossing beach balls, banging on bongo drums and playing reggae music.

"I came out today to show support for the black community and for all minority communities," said Rockeem Robinson, 21, a youth worker from Cambridge.

He said he was not concerned about his personal safety because he felt more support on his side.

Katie Griffiths, 48, a social worker also from Cambridge, who works with members of poor and minority communities, said she finds the hate and violence happening "very scary".

"I see poor people and people of color being scapegoated," she said. "Unlearned lessons can be repeated."

Events were also planned around the country, in cities including Atlanta, Dallas and New Orleans.

Social media users celebrated developments in Boston as a feat against rising racism and hate crimes in the United States.

However, President Donald Trump berated counter protesters, accusing them of being "anti-police agitators".

Trump, whose response to white-supremacist-led violence in Charlottesville has been heavily criticized, tweeted: "Looks like many anti-police agitators in Boston. Police are looking tough and smart! Thank you."

The president later tweeted: "I want to applaud the many protesters in Boston who are speaking out against bigotry and hate. Our country will soon come together as one!"

It was unclear which set of "protesters" Trump was referring to.