MADRID — The vast majority of Catalonia's almost 1,000 mayors on Saturday urged authorities in Madrid to grant the region the right to determine its own future, as crowds of separatists readied for a protest march in Barcelona later in the day.

The Catalan capital has been convulsed by almost two weeks of daily demonstrations since nine politicians and activists were jailed for between nine and 13 years for their role in an independence bid in 2017 that Spain's courts had declared illegal.

Mayors representing 814 of the region's 947 local authorities gathered at the headquarters of the regional government to present its leader Quim Torra with a document whose core message — liberty for political prisoners, dialogue and self-determination — they had all endorsed.

To chants of "independence", Torra said: "Your presence is a sign of unity, a unity that is necessary and that we need to maintain against repression.

"We have to be capable of creating a republic of free men and woman ... and overcoming the confrontational dynamic with a constructive one."

The gathering marked the opening act of a day of protest due to culminate in a march through the city center that organizers Assemblea Nacional Catalana and Omnium Cultural — grassroots groups whose leaders are among the nine serving jail terms — hope will draw the largest crowds of any demonstration since the sentences were passed.

Both groups say they are committed to peaceful protests, but some of last week's marches were marred by violence, including clashes between demonstrators and police.

In an interview with Reuters last week, Torra called on Madrid to open talks with a view to the region holding a second referendum.

Spain's main parties, including the minority Socialist government, have consistently rejected any moves towards secession, a stance they have reiterated in recent days as the country gears up for a national election on Nov. 10.

Catalonia's electorate is itself split over the issue of independence, and supporters of continued unity with Spain will hold a rival rally in Barcelona on Sunday that the leaders of the country two main centre-right parties, PP and Ciudadanos, are due to attend.

Nearly 300 police were injured in the violent protests which erupted across Catalonia following the jailing of nine Catalan separatist leaders earlier this month, the Spanish government said Friday.

A total of 289 police officers were injured in the clashes, including 154 from Catalonia's regional police force, the Mossos d'Esquadra, government spokeswoman Isabel Celaa told a news conference following a weekly Cabinet meeting.

Catalonia's regional emergency services had previously said they had treated 593 people injured in the protests between Oct. 14 and 20, including 226 police officers.

The latest toll for the number of injured police is higher because some officers were treated in private clinics, a spokesman for the Interior Ministry said.

A powerful grassroots separatist organization, ANC, said Wednesday that according to Catalonia's regional health department, 579 people were injured by "police violence" in the protests.

Celaa said over 200 people were arrested during the protests. Of these, 134 adults and 15 minors have appeared before a judge and 31 were sent to jail. Of the 15 minors, 14 were released on probation and one was placed in a juvenile detention center.

The streets of Barcelona and other Catalan cities were rocked by demonstrations for several days after Spain's Supreme Court on Oct. 14 sentenced the nine leaders, mostly former members of the Catalan regional government, to prison terms of up to 13 years for sedition over a failed 2017 independence bid.

Demonstrators set fire to cars and garbage bins and threw rocks, Molotov cocktails and steel balls at police, who responded with batons and rubber bullets. — Agencies