Protesters carry items to build a barricade as a pro-democracy march was held in the Kowloon district in Hong Kong (Photo by ANTHONY WALLACE/AFP via Getty Images)

People react from tear gas fired by police at Mongkok during a pro-democracy rally in Kowloon district in Hong Kong (Photo by Philip FONG / AFP)

Hong Kong protesters flooded the streets again on Sunday, ignoring a police ban on the rally and setting up barricades amid tear gas and firebombs.

Protest leaders carried a black banner at the front of the procession with the slogan "Five main demands, not one less", as they pressed their calls for accountability and political rights.

Black-clad and masked protesters barricaded streets at multiple locations in Kowloon, where the city's subway operator restricted passenger access. A firebomb was thrown at one subway station.

The protesters tore up paving stones from the pavement and scattered them on the road, commandeered plastic safety barriers and unscrewed metal railings to form makeshift roadblocks.

Expand Close Protesters carry items to build a barricade as a pro-democracy march was held in the Kowloon district in Hong Kong (Photo by ANTHONY WALLACE/AFP via Getty Images) AFP via Getty Images / Facebook

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Whatsapp Protesters carry items to build a barricade as a pro-democracy march was held in the Kowloon district in Hong Kong (Photo by ANTHONY WALLACE/AFP via Getty Images)

Police fired tear gas after firebombs were thrown towards one station as tens of thousands of demonstrators marched down a main road with traffic at a standstill.

They sang along to the protest movement's anthem and held up placards depicting the Chinese flag as a Nazi swastika.

Matthew Lee, a university student, said he was determined to keep protesting even after five months.

"I can see some people want to give up but I don't want to do this because Hong Kong is my home, we want to protect this place, protect Hong Kong," he said. "You can't give up because Hong Kong is your home."

Police had beefed up security measures for the unauthorised rally, the latest in the five-month-old unrest rocking the semi-autonomous Chinese city.

Many of the supporters of the movement wore masks in defiance of a recently introduced ban on face coverings at public gatherings, and volunteers handed more out to the crowd.

Organisers said they wanted to use their right to protest, as guaranteed by the city's constitution despite the risk of arrest.

"We're using peaceful, rational, non-violent way to voice our demands," said Figo Chan, vice convener of the Civil Human Rights Front.

"We're not afraid of being arrested. What I'm most scared of is everyone giving up on our principles."

The group has organised some of the movement's biggest protest marches. One of its leaders, Jimmy Sham, was attacked on Wednesday by assailants wielding hammers.

On Saturday, police arrested a 22-year-old man on suspicion of stabbing a teenage activist who was distributing leaflets near a wall plastered with pro-democracy messages.

A witness told local broadcaster RTHK that the assailant shouted afterwards that Hong Kong is "a part of China" and other pro-Beijing messages.

The movement sprang out of opposition to a government proposal for a China extradition Bill and then ballooned into broader demands for full democracy and an inquiry into alleged police brutality.

PA Media