Heavy clashes erupted again on the sidelines of the Barcelona march, which drew more than half a million protesters

Barcelona (AFP) - Violent clashes escalated in Barcelona late Friday, as radical Catalan separatists hurled rocks and fireworks at police, who responded with teargas and rubber bullets, turning the city centre into a chaotic battleground.

The deterioration came on the fifth consecutive day of protests in the Catalan capital and elsewhere over a Spanish court’s jailing of nine separatist leaders on sedition charges over a failed independence bid two years ago.

Around half a million people rallied in Barcelona earlier on Friday in the biggest gathering since Monday’s court ruling as separatists also called a general strike in the major tourist destination.

More than half a million people rallied in Barcelona on Friday in the biggest protest since the sentence

But while most marchers appeared peaceful, hoards of young protesters went on the rampage near the police headquarters, igniting a huge blaze which sent plumes of black smoke into the air, as police fired teargas to disperse them, an AFP correspondent said.

Other fires raged near Plaza de Catalunya at the top of the tourist hotspot Las Ramblas, where hundreds of demonstrators rallied in defiance of the police, who tried to disperse them with water canon.

“Anti-fascist Catalonia!” they roared. “The streets will always be ours!”

Scores of police vans could be seen fanning out around the streets, their sirens screaming as the regional police warned people in a message in English on Twitter “not to approach” the city centre.

Earlier, many thousands of “freedom marchers”, who had set out to walk from five regional towns on Wednesday, arrived in Barcelona wearing walking boots and carrying hiking poles.

Barcelona officials say more than 700 large wheelie bins have been vandalised along with traffic lights, road signs and the city's bike share service

The rally coincided with the general strike, prompting the cancellation of 57 flights, the closure of shops, business and several top tourist attractions, and slowing public transport to a trickle in a region that accounts for about a fifth of Spain’s economic output.

Activists also cut off Catalonia’s main cross-border highway with France.

- ‘Reaction to injustice’ -

In downtown Barcelona, many shops and luxury outlets were closed on the city’s Paseo de Gracia, with blackened, charred patches a testimony to the nightly clashes that have raged since Monday.

Police fired tear gas to break up the protesters, most of whom were youngsters

“With these demonstrations bringing this large city to a halt, we are using Barcelona like a microphone,” said 23-year-old engineering student Ramon Pararada.

“It’s all in reaction to the injustice,” he said.

Retired lawyer Jaume Enrich agreed, saying the court sentence was “the straw that broke the camel’s back.”

“Madrid is putting Spanish unity above everything, including basic rights,” he told AFP, wearing a badge saying “No surrender”.

Nearby a banner fluttered reading “There are not enough cages for this many birds.”

- Clashes and closures -

The huge turnout came after yet another night of violent clashes, which Catalan regional interior minister Miquel Buch said involved “fewer incidents, but more violent”.

And Barcelona city council said the first three days of clashes had cost an estimated 1.57 million euros ($1.75 million) in damage, with more than 700 large wheelie bins torched and mob violence also damaging traffic lights, street signs, trees and the city’s bike-share service.

The Sagrada Familia basilica was forced to close its doors after protesters rallied in front of it, blocking visitors

In Barcelona, Spain’s top tourist destination, the Sagrada Familia basilica closed as protesters massed outside, and the famous Liceu opera house cancelled Friday night’s performance.

Barcelona’s huge wholesale market, which exports around a third of the region’s fresh produce, was barely trading on Friday, and at the city’s famed La Boqueria market, most of the stalls were closed.

At one stall, Barcelona-born Susana Medialdea, 53, was selling olives and pickles entirely dressed in yellow.

“I came in voluntarily to work but only as long as I could wear yellow to express my total disagreement with the sentence,” she told AFP, saying she felt “very angry” about it.

Map of "freedom marches" in Catalonia which converged in Barcelona Friday

But another veteran stallholder took the opposite view.

“I am a real Catalan but I don’t support this independence project at all, people are letting themselves be used, above all the youth,” said 75-year-old Carmen Isern, accusing the secessionists of dishonesty.

“We’ve had seven years of lies. They only tell the teenagers bad things about Spain.”

- Spain’s Clasico postponed -

With the region mired in chaos, football authorities cancelled the Barcelona and Real Madrid Clasico set for October 26 at the Camp Nou stadium. Both clubs had reportedly refused an offer to hold the match in Madrid.

And Manchester City’s Catalan manager Pep Guardiola, an outspoken campaigner for the independence movement, urged European intervention to ease the crisis.

“The international community must help us to solve the conflict between Catalonia and Spain,” he said. “Some mediator from outside (must) help us sit (down) and talk.”

The Supreme Court’s explosive decision has thrust the Catalan dispute to the heart of the political debate as Spain heads towards a fourth election in as many years, which will be held on November 10.