(CNN) Fires and violence broke out in the streets of Barcelona on Friday, as more than half a million pro-independence protesters gathered in the Catalan capital, the local police said.

Nine people, including four minors, have been arrested Friday, a spokesman for the Spanish Interior Ministry told CNN. The spokesperson said the clashes left three police officers injured.

The protesters have been out in force every night since Monday, when nine Catalan politicians were handed heavy sentences by the Spanish Supreme Court for their role in an independence movement that tried to separate Catalonia from the rest of Spain two years ago.

Video from the scenes on Friday showed riot police facing off against protestors, some of whom threw objects at the police. Garbage containers were set on fire, a common sight in the past week. The Barcelona City Council said that 700 bins have been burned during the riots over the past three nights.

Trees, pavements, traffic lights and public signs were damaged, with the total cost to the city so far reaching more than €1.5 million ($1.7 million). Dozens of roads in and around Barcelona remained closed to traffic.

Fires burn in Barcelona on Friday following another evening of rioting sparked by the jailing of Catalan independence politicians.

Members of the public view the damage on Saturday after the night of rioting in Barcelona.

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